Foundation for tiling optimization

Change-Id: I4db32a4749f196472ba0dde7e102439d2ba4a3a7
diff --git a/libs/hwui/Caches.h b/libs/hwui/Caches.h
index 6d27d6e..50e9e75 100644
--- a/libs/hwui/Caches.h
+++ b/libs/hwui/Caches.h
@@ -211,6 +211,9 @@
     bool disableScissor();
     void setScissorEnabled(bool enabled);
 
+    void startTiling(GLuint x, GLuint y, GLuint width, GLuint height, bool opaque);
+    void endTiling();
+
     /**
      * Returns the mesh used to draw regions. Calling this method will
      * bind a VBO of type GL_ELEMENT_ARRAY_BUFFER that contains the