Move blur code from FontRenderer to utils/Blur.cpp

Change-Id: I2cebbfbcb722ed4b37e54ffbf8b53bb92ad0c964
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index 33d8063..85b2052 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -5,6 +5,7 @@
 # defined in the current device/board configuration
 ifeq ($(USE_OPENGL_RENDERER),true)
 	LOCAL_SRC_FILES:= \
+		utils/Blur.cpp \
 		utils/SortedListImpl.cpp \
 		font/CacheTexture.cpp \
 		font/Font.cpp \