Adding A feature flag to disable widgets  and a corresponding build
target Launcher3Go without widgets support

Bug: 62353159
Change-Id: Ia03d2235a9bcf75f9ef191924f81630e63a2c684
diff --git a/Android.mk b/Android.mk
index 0543b42..d41e184 100644
--- a/Android.mk
+++ b/Android.mk
@@ -17,7 +17,7 @@
 LOCAL_PATH := $(call my-dir)
 
 #
-# Build app code.
+# Build rule for Launcher3 app.
 #
 include $(CLEAR_VARS)
 
@@ -63,6 +63,57 @@
 include $(BUILD_PACKAGE)
 
 #
+# Build rule for Launcher3 Go app for Android Go devices.
+#
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_STATIC_JAVA_LIBRARIES := \
+    android-support-v4 \
+    android-support-v7-recyclerview \
+    android-support-v7-palette \
+    android-support-dynamic-animation
+
+LOCAL_SRC_FILES := \
+    $(call all-java-files-under, src) \
+    $(call all-java-files-under, src_config) \
+    $(call all-java-files-under, go/src_flags) \
+    $(call all-proto-files-under, protos) \
+    $(call all-proto-files-under, proto_overrides)
+
+LOCAL_RESOURCE_DIR := \
+    $(LOCAL_PATH)/go/res \
+    $(LOCAL_PATH)/res \
+    prebuilts/sdk/current/support/v7/recyclerview/res \
+
+LOCAL_PROGUARD_FLAG_FILES := proguard.flags
+
+LOCAL_PROTOC_OPTIMIZE_TYPE := nano
+LOCAL_PROTOC_FLAGS := --proto_path=$(LOCAL_PATH)/protos/ --proto_path=$(LOCAL_PATH)/proto_overrides/
+LOCAL_PROTO_JAVA_OUTPUT_PARAMS := enum_style=java
+
+LOCAL_AAPT_FLAGS := \
+    --auto-add-overlay \
+    --extra-packages android.support.v7.recyclerview \
+
+LOCAL_SDK_VERSION := current
+LOCAL_MIN_SDK_VERSION := 21
+LOCAL_PACKAGE_NAME := Launcher3Go
+LOCAL_PRIVILEGED_MODULE := true
+LOCAL_OVERRIDES_PACKAGES := Home Launcher2 Launcher3
+
+LOCAL_FULL_LIBS_MANIFEST_FILES := \
+    $(LOCAL_PATH)/AndroidManifest.xml \
+    $(LOCAL_PATH)/AndroidManifest-common.xml
+
+LOCAL_MANIFEST_FILE := go/AndroidManifest.xml
+
+LOCAL_JACK_COVERAGE_INCLUDE_FILTER := com.android.launcher3.*
+
+include $(BUILD_PACKAGE)
+
+#
 # Launcher proto buffer jar used for development
 #
 include $(CLEAR_VARS)