Shader changes to allow for more flexible constant binding.

Change-Id: Ic66e6e2a371c6e3d5dce1b00f63acab8c09bd110
diff --git a/rsFont.h b/rsFont.h
index defe38b..027ed1d 100644
--- a/rsFont.h
+++ b/rsFont.h
@@ -171,6 +171,7 @@
     Vector<Font*> mActiveFonts;
 
     // Render state for the font
+    ObjectBaseRef<Allocation> mFontShaderFConstant;
     ObjectBaseRef<ProgramFragment> mFontShaderF;
     ObjectBaseRef<Sampler> mFontSampler;
     ObjectBaseRef<ProgramStore> mFontProgramStore;