Implement instanced rendering for simple shapes

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index 61b39079b0cbd71a0499e577aabba76942516e31..92a12ffa760f73a6d454e11096603a5e3869ff9b 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -308,7 +308,9 @@ private:
 
     GrDrawBatch* getFillRectBatch(const GrPaint& paint,
                                   const SkMatrix& viewMatrix,
-                                  const SkRect& rect);
+                                  const SkRect& rect,
+                                  uint32_t extraInstRenderFlags,
+                                  bool* enableHWAA);
 
     void internalDrawPath(const GrClip& clip,
                           const GrPaint& paint,
@@ -330,6 +332,7 @@ private:
     GrDrawTarget*                     fDrawTarget;
     SkAutoTDelete<GrAtlasTextContext> fAtlasTextContext;
     GrContext*                        fContext;
+    uint32_t                          fInstancedRenderingFlags;
 
     SkSurfaceProps                    fSurfaceProps;
     GrAuditTrail*                     fAuditTrail;