Add hack for custom re-rasterization buckets

bug:14083128

Moves all of the font transform management into
OpenGLRenderer::findBestFontTransform(), and now simply passes down
final rasterization transforms into the FontRenderer.

Change-Id: Ie02752e6af863347b142367c7d628db5f9fc2998
diff --git a/libs/hwui/FontRenderer.h b/libs/hwui/FontRenderer.h
index 8ce22b0..5c96c6b4 100644
--- a/libs/hwui/FontRenderer.h
+++ b/libs/hwui/FontRenderer.h
@@ -95,9 +95,9 @@
         mGammaTable = gammaTable;
     }
 
-    void setFont(const SkPaint* paint, const mat4& matrix);
+    void setFont(const SkPaint* paint, const SkMatrix& matrix);
 
-    void precache(const SkPaint* paint, const char* text, int numGlyphs, const mat4& matrix);
+    void precache(const SkPaint* paint, const char* text, int numGlyphs, const SkMatrix& matrix);
     void endPrecaching();
 
     // bounds is an out parameter