Add support for sending VSYNC events to the framework

use gui/DisplayEvent to receive the events. Events are
dispatched through a unix pipe, so the API is compatible
with utils/Looper. see gui/DisplayEvent.h for more info.

Bug: 1475048
Change-Id: Ia720f64d1b950328b47b22c6a86042e481d35f09
diff --git a/services/surfaceflinger/Android.mk b/services/surfaceflinger/Android.mk
index f63c0c1..95d651a 100644
--- a/services/surfaceflinger/Android.mk
+++ b/services/surfaceflinger/Android.mk
@@ -2,19 +2,22 @@
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:= \
-    Layer.cpp 								\
-    LayerBase.cpp 							\
-    LayerDim.cpp 							\
-    LayerScreenshot.cpp						\
-    DdmConnection.cpp						\
-    DisplayHardware/DisplayHardware.cpp 	\
+    EventThread.cpp                         \
+    Layer.cpp                               \
+    LayerBase.cpp                           \
+    LayerDim.cpp                            \
+    LayerScreenshot.cpp                     \
+    DdmConnection.cpp                       \
+    DisplayHardware/DisplayHardware.cpp     \
     DisplayHardware/DisplayHardwareBase.cpp \
-    DisplayHardware/HWComposer.cpp 			\
-    GLExtensions.cpp 						\
-    MessageQueue.cpp 						\
-    SurfaceFlinger.cpp 						\
-    SurfaceTextureLayer.cpp 				\
-    Transform.cpp 							\
+    DisplayHardware/HWComposer.cpp          \
+    DisplayHardware/VSyncBarrier.cpp        \
+    DisplayEventConnection.cpp              \
+    GLExtensions.cpp                        \
+    MessageQueue.cpp                        \
+    SurfaceFlinger.cpp                      \
+    SurfaceTextureLayer.cpp                 \
+    Transform.cpp                           \
     
 
 LOCAL_CFLAGS:= -DLOG_TAG=\"SurfaceFlinger\"