Add CanvasState tests

Change-Id: Idcd022f6e4015e074d8e73b4c116e0788fd4f045
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index 676ab1c..3eb13ab 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -165,6 +165,7 @@
 LOCAL_CFLAGS := $(hwui_cflags)
 
 LOCAL_SRC_FILES += \
+    unit_tests/CanvasStateTests.cpp \
     unit_tests/ClipAreaTests.cpp \
     unit_tests/DamageAccumulatorTests.cpp \
     unit_tests/LinearAllocatorTests.cpp