Frameworks/base: Wall Werror in native/graphics

Turn on -Wall -Werror in native/graphics. Mask skia warnings.

Change-Id: Ia671e91348296ace84d9a24b3c6c025fa889bead
diff --git a/native/graphics/jni/Android.mk b/native/graphics/jni/Android.mk
index 3154030..88954f0 100644
--- a/native/graphics/jni/Android.mk
+++ b/native/graphics/jni/Android.mk
@@ -6,27 +6,29 @@
 # setup for skia optimizations
 #
 ifneq ($(ARCH_ARM_HAVE_VFP),true)
-	LOCAL_CFLAGS += -DSK_SOFTWARE_FLOAT
+    LOCAL_CFLAGS += -DSK_SOFTWARE_FLOAT
 endif
 
 ifeq ($(ARCH_ARM_HAVE_NEON),true)
-	LOCAL_CFLAGS += -D__ARM_HAVE_NEON
+    LOCAL_CFLAGS += -D__ARM_HAVE_NEON
 endif
 
 # our source files
 #
 LOCAL_SRC_FILES:= \
-	bitmap.cpp
+    bitmap.cpp
 
 LOCAL_SHARED_LIBRARIES := \
     libandroid_runtime \
     libskia
 
 LOCAL_C_INCLUDES += \
-	frameworks/base/native/include \
-	frameworks/base/core/jni/android/graphics
+    frameworks/base/native/include \
+    frameworks/base/core/jni/android/graphics
 
 LOCAL_MODULE:= libjnigraphics
 
+LOCAL_CFLAGS += -Wall -Werror -Wunused -Wunreachable-code
+
 include $(BUILD_SHARED_LIBRARY)