diff --git a/core/base_rules.mk b/core/base_rules.mk
index 7e2e127..42bb641 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -263,6 +263,38 @@
 endif
 
 ###########################################################
+## .proto files: Compile proto files to .java
+###########################################################
+proto_sources := $(filter %.proto,$(LOCAL_SRC_FILES))
+# Because names of the .java files compiled from .proto files are unknown until the
+# .proto files are compiled, we use a timestamp file as depedency.
+proto_java_sources_file_stamp :=
+ifneq ($(proto_sources),)
+proto_sources_fullpath := $(addprefix $(TOP_DIR)$(LOCAL_PATH)/, $(proto_sources))
+# By putting the generated java files into $(LOCAL_INTERMEDIATE_SOURCE_DIR), they will be
+# automatically found by the java compiling function transform-java-to-classes.jar.
+proto_java_intemediate_dir := $(LOCAL_INTERMEDIATE_SOURCE_DIR)/proto
+proto_java_sources_file_stamp := $(proto_java_intemediate_dir)/Proto.stamp
+proto_java_sources_dir := $(proto_java_intemediate_dir)/src
+
+$(proto_java_sources_file_stamp): PRIVATE_PROTO_INCLUDES := $(TOP)
+$(proto_java_sources_file_stamp): PRIVATE_PROTO_SRC_FILES := $(proto_sources_fullpath)
+$(proto_java_sources_file_stamp): PRIVATE_PROTO_JAVA_OUTPUT_DIR := $(proto_java_sources_dir)
+ifeq ($(LOCAL_PROTOC_OPTIMIZE_TYPE),micro)
+$(proto_java_sources_file_stamp): PRIVATE_PROTO_JAVA_OUTPUT_OPTION := --javamicro_out
+else
+$(proto_java_sources_file_stamp): PRIVATE_PROTO_JAVA_OUTPUT_OPTION := --java_out
+endif
+$(proto_java_sources_file_stamp) : $(proto_sources_fullpath) $(PROTOC)
+	$(call transform-proto-to-java)
+
+#TODO: protoc should output the dependencies introduced by imports.
+
+LOCAL_INTERMEDIATE_TARGETS += $(proto_java_sources_file_stamp)
+endif # proto_sources
+
+
+###########################################################
 ## Java: Compile .java files to .class
 ###########################################################
 #TODO: pull this into java.make once host and target are combined
diff --git a/core/binary.mk b/core/binary.mk
index 48d1ba7..9ebf8c6 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -146,6 +146,43 @@
 
 
 ###########################################################
+## Compile the .proto files to .cc and then to .o
+###########################################################
+proto_sources := $(filter %.proto,$(LOCAL_SRC_FILES))
+proto_generated_objects :=
+proto_generated_headers :=
+ifneq ($(proto_sources),)
+proto_sources_fullpath := $(addprefix $(LOCAL_PATH)/, $(proto_sources))
+proto_generated_cc_sources_dir := $(intermediates)/proto
+proto_generated_cc_sources := $(addprefix $(proto_generated_cc_sources_dir)/, \
+	$(patsubst %.proto,%.pb.cc,$(proto_sources_fullpath)))
+proto_generated_objects := $(patsubst %.cc,%.o, $(proto_generated_cc_sources))
+
+$(proto_generated_cc_sources): PRIVATE_PROTO_INCLUDES := $(TOP)
+$(proto_generated_cc_sources): PRIVATE_PROTO_CC_OUTPUT_DIR := $(proto_generated_cc_sources_dir)
+$(proto_generated_cc_sources): $(proto_generated_cc_sources_dir)/%.pb.cc: %.proto $(PROTOC)
+	$(transform-proto-to-cc)
+
+proto_generated_headers := $(patsubst %.pb.cc,%.pb.h, $(proto_generated_cc_sources))
+$(proto_generated_headers): $(proto_generated_cc_sources_dir)/%.pb.h: $(proto_generated_cc_sources_dir)/%.pb.cc
+
+$(proto_generated_cc_sources): PRIVATE_ARM_MODE := $(normal_objects_mode)
+$(proto_generated_cc_sources): PRIVATE_ARM_CFLAGS := $(normal_objects_cflags)
+$(proto_generated_objects): $(proto_generated_cc_sources_dir)/%.o: $(proto_generated_cc_sources_dir)/%.cc
+	$(transform-$(PRIVATE_HOST)cpp-to-o)
+-include $(proto_generated_objects:%.o=%.P)
+
+LOCAL_C_INCLUDES += external/protobuf/src $(proto_generated_cc_sources_dir)
+LOCAL_CFLAGS += -DGOOGLE_PROTOBUF_NO_RTTI
+ifeq ($(LOCAL_PROTOC_OPTIMIZE_TYPE),full)
+LOCAL_STATIC_LIBRARIES += libprotobuf-cpp-2.3.0-full
+else
+LOCAL_STATIC_LIBRARIES += libprotobuf-cpp-2.3.0-lite
+endif
+endif
+
+
+###########################################################
 ## YACC: Compile .y files to .cpp and the to .o.
 ###########################################################
 
@@ -213,7 +250,7 @@
 ifneq ($(strip $(cpp_objects)),)
 $(cpp_objects): $(intermediates)/%.o: \
 		$(TOPDIR)$(LOCAL_PATH)/%$(LOCAL_CPP_EXTENSION) \
-		$(yacc_cpps) $(LOCAL_ADDITIONAL_DEPENDENCIES)
+		$(yacc_cpps) $(proto_generated_headers) $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-$(PRIVATE_HOST)cpp-to-o)
 -include $(cpp_objects:%.o=%.P)
 endif
@@ -230,7 +267,7 @@
 # TODO: support compiling certain generated files as arm.
 $(gen_cpp_objects): PRIVATE_ARM_MODE := $(normal_objects_mode)
 $(gen_cpp_objects): PRIVATE_ARM_CFLAGS := $(normal_objects_cflags)
-$(gen_cpp_objects): $(intermediates)/%.o: $(intermediates)/%$(LOCAL_CPP_EXTENSION) $(yacc_cpps) $(LOCAL_ADDITIONAL_DEPENDENCIES)
+$(gen_cpp_objects): $(intermediates)/%.o: $(intermediates)/%$(LOCAL_CPP_EXTENSION) $(yacc_cpps) $(proto_generated_headers) $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-$(PRIVATE_HOST)cpp-to-o)
 -include $(gen_cpp_objects:%.o=%.P)
 endif
@@ -277,7 +314,7 @@
 c_objects        := $(c_arm_objects) $(c_normal_objects)
 
 ifneq ($(strip $(c_objects)),)
-$(c_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.c $(yacc_cpps) $(LOCAL_ADDITIONAL_DEPENDENCIES)
+$(c_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.c $(yacc_cpps) $(proto_generated_headers) $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-$(PRIVATE_HOST)c-to-o)
 -include $(c_objects:%.o=%.P)
 endif
@@ -294,7 +331,7 @@
 # TODO: support compiling certain generated files as arm.
 $(gen_c_objects): PRIVATE_ARM_MODE := $(normal_objects_mode)
 $(gen_c_objects): PRIVATE_ARM_CFLAGS := $(normal_objects_cflags)
-$(gen_c_objects): $(intermediates)/%.o: $(intermediates)/%.c $(yacc_cpps) $(LOCAL_ADDITIONAL_DEPENDENCIES)
+$(gen_c_objects): $(intermediates)/%.o: $(intermediates)/%.c $(yacc_cpps) $(proto_generated_headers) $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-$(PRIVATE_HOST)c-to-o)
 -include $(gen_c_objects:%.o=%.P)
 endif
@@ -307,7 +344,7 @@
 objc_objects := $(addprefix $(intermediates)/,$(objc_sources:.m=.o))
 
 ifneq ($(strip $(objc_objects)),)
-$(objc_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.m $(yacc_cpps) $(PRIVATE_ADDITIONAL_DEPENDENCIES)
+$(objc_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.m $(yacc_cpps) $(proto_generated_headers) $(PRIVATE_ADDITIONAL_DEPENDENCIES)
 	$(transform-$(PRIVATE_HOST)m-to-o)
 -include $(objc_objects:%.o=%.P)
 endif
@@ -352,6 +389,7 @@
 	$(gen_c_objects) \
 	$(yacc_objects) \
 	$(lex_objects) \
+	$(proto_generated_objects) \
 	$(addprefix $(TOPDIR)$(LOCAL_PATH)/,$(LOCAL_PREBUILT_OBJ_FILES))
 
 LOCAL_C_INCLUDES += $(TOPDIR)$(LOCAL_PATH) $(intermediates) $(base_intermediates)
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 2c27300..8ed3789 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -100,6 +100,7 @@
 LOCAL_MANIFEST_FILE:=
 LOCAL_BUILD_HOST_DEX:=
 LOCAL_DEX_PREOPT:=
+LOCAL_PROTOC_OPTIMIZE_TYPE:= # lite(default),micro,full
 
 # Trim MAKEFILE_LIST so that $(call my-dir) doesn't need to
 # iterate over thousands of entries every time.
diff --git a/core/config.mk b/core/config.mk
index 1282ad6..9b588cf 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -200,6 +200,7 @@
 DOXYGEN:= doxygen
 AAPT := $(HOST_OUT_EXECUTABLES)/aapt$(HOST_EXECUTABLE_SUFFIX)
 AIDL := $(HOST_OUT_EXECUTABLES)/aidl$(HOST_EXECUTABLE_SUFFIX)
+PROTOC := $(HOST_OUT_EXECUTABLES)/aprotoc$(HOST_EXECUTABLE_SUFFIX)
 ICUDATA := $(HOST_OUT_EXECUTABLES)/icudata$(HOST_EXECUTABLE_SUFFIX)
 SIGNAPK_JAR := $(HOST_OUT_JAVA_LIBRARIES)/signapk$(COMMON_JAVA_PACKAGE_SUFFIX)
 MKBOOTFS := $(HOST_OUT_EXECUTABLES)/mkbootfs$(HOST_EXECUTABLE_SUFFIX)
diff --git a/core/definitions.mk b/core/definitions.mk
index ca8bc67..ac431df 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -236,6 +236,19 @@
 endef
 
 ###########################################################
+## Find all of the .proto files under the named directories.
+## Meant to be used like:
+##    SRC_FILES := $(call all-proto-files-under,src)
+###########################################################
+
+define all-proto-files-under
+$(patsubst ./%,%, \
+  $(shell cd $(LOCAL_PATH) ; \
+          find $(1) -name "*.proto" -and -not -name ".*") \
+  )
+endef
+
+###########################################################
 ## Find all of the html files under the named directories.
 ## Meant to be used like:
 ##    SRC_FILES := $(call all-html-files-under,src tests)
@@ -746,6 +759,34 @@
 
 
 ###########################################################
+## Commands for running protoc to compile .proto into .java
+###########################################################
+
+define transform-proto-to-java
+@mkdir -p $(dir $@)
+@echo "Protoc: $@ <= $(PRIVATE_PROTO_SRC_FILES)"
+@rm -rf $(PRIVATE_PROTO_JAVA_OUTPUT_DIR)
+@mkdir -p $(PRIVATE_PROTO_JAVA_OUTPUT_DIR)
+$(hide) $(PROTOC) \
+	$(addprefix --proto_path=, $(PRIVATE_PROTO_INCLUDES)) \
+	$(PRIVATE_PROTO_JAVA_OUTPUT_OPTION)=$(PRIVATE_PROTO_JAVA_OUTPUT_DIR) \
+	$(PRIVATE_PROTO_SRC_FILES)
+$(hide) touch $@
+endef
+
+######################################################################
+## Commands for running protoc to compile .proto into .pb.cc and .pb.h
+######################################################################
+define transform-proto-to-cc
+@mkdir -p $(dir $@)
+@echo "Protoc: $@ <= $<"
+$(hide) $(PROTOC) \
+	$(addprefix --proto_path=, $(PRIVATE_PROTO_INCLUDES)) \
+	--cpp_out=$(PRIVATE_PROTO_CC_OUTPUT_DIR) $<
+endef
+
+
+###########################################################
 ## Commands for running gcc to compile a C++ file
 ###########################################################
 
diff --git a/core/java.mk b/core/java.mk
index 6b8d04d..35b0343 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -32,6 +32,16 @@
     LOCAL_JAVA_LIBRARIES := core core-junit ext framework $(LOCAL_JAVA_LIBRARIES)
   endif
 endif
+
+proto_sources := $(filter %.proto,$(LOCAL_SRC_FILES))
+ifneq ($(proto_sources),)
+ifeq ($(LOCAL_PROTOC_OPTIMIZE_TYPE),micro)
+    LOCAL_STATIC_JAVA_LIBRARIES += libprotobuf-java-2.3.0-micro
+else
+    LOCAL_STATIC_JAVA_LIBRARIES += libprotobuf-java-2.3.0-lite
+endif
+endif
+
 LOCAL_JAVA_LIBRARIES := $(sort $(LOCAL_JAVA_LIBRARIES))
 
 LOCAL_BUILT_MODULE_STEM := $(strip $(LOCAL_BUILT_MODULE_STEM))
@@ -167,7 +177,8 @@
 # Deps for generated source files must be handled separately,
 # via deps on the target that generates the sources.
 $(full_classes_compiled_jar): PRIVATE_JAVACFLAGS := $(LOCAL_JAVACFLAGS)
-$(full_classes_compiled_jar): $(java_sources) $(java_resource_sources) $(full_java_lib_deps) $(jar_manifest_file)
+$(full_classes_compiled_jar): $(java_sources) $(java_resource_sources) $(full_java_lib_deps) $(jar_manifest_file) \
+	$(RenderScript_file_stamp) $(proto_java_sources_file_stamp)
 	$(transform-java-to-classes.jar)
 
 # All of the rules after full_classes_compiled_jar are very unlikely