Expand pixelref to return SkImageInfo and rowbytes

include/gpu/SkGrPixelRef.h

Index: include/gpu/SkGrPixelRef.h
diff --git a/include/gpu/SkGrPixelRef.h b/include/gpu/SkGrPixelRef.h
index da4b8fae090dfab8d0fd6860426a612a5d5de52f..bc4a1375cbe64e78c7c651717e4a8b1fc95c8f0c 100644
--- a/include/gpu/SkGrPixelRef.h
+++ b/include/gpu/SkGrPixelRef.h
@@ -28,9 +28,9 @@ public:
 
 protected:
     // override from SkPixelRef
-    virtual void* onLockPixels(SkColorTable** ptr);
-    virtual void onUnlockPixels();
-    virtual bool onLockPixelsAreWritable() const;   // return false;
+    virtual void* onLockPixels(SkImageInfo*, size_t* rowBytes, SkColorTable**) SK_OVERRIDE;
+    virtual void onUnlockPixels() SK_OVERRIDE;
+    virtual bool onLockPixelsAreWritable() const SK_OVERRIDE;   // return false;
 
 private:
     SkBitmap    fBitmap;