Create GrDraw and start fast pathing src over rects

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index 97cb72a7f2e530166874b8998dd132b5a95653d1..3205f2ba53513ec62ff519a0c68d67cc037f1ac3 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -14,6 +14,7 @@
 
 class GrClip;
 class GrContext;
+class GrDraw;
 class GrDrawBatch;
 class GrDrawTarget;
 class GrPaint;
@@ -259,6 +260,11 @@ public:
      */
     void drawBatch(GrRenderTarget*, const GrClip&, const GrPaint&, GrDrawBatch*);
 
+    /**
+     * Experimental draw interface
+     */
+    void draw(const GrDraw&);
+
 private:
     friend class GrAtlasTextContext; // for access to drawBatch
     friend class GrContext; // for ctor