Add onNewLockPixels, that returns rowbytes and relies on info in pixelref

include/gpu/SkGrPixelRef.h

Index: include/gpu/SkGrPixelRef.h
diff --git a/include/gpu/SkGrPixelRef.h b/include/gpu/SkGrPixelRef.h
index d8933724fbb32b6b22567a305ad7ae1ce96499b6..63e975673fd49ebf603d02d94aeac17e871efe26 100644
--- a/include/gpu/SkGrPixelRef.h
+++ b/include/gpu/SkGrPixelRef.h
@@ -24,10 +24,9 @@ public:
     virtual ~SkROLockPixelsPixelRef();
 
 protected:
-    // override from SkPixelRef
-    virtual void* onLockPixels(SkColorTable** ptr);
-    virtual void onUnlockPixels();
-    virtual bool onLockPixelsAreWritable() const;   // return false;
+    virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE;
+    virtual void onUnlockPixels() SK_OVERRIDE;
+    virtual bool onLockPixelsAreWritable() const SK_OVERRIDE;   // return false;
 
 private:
     SkBitmap    fBitmap;