Fix for copy surface not handling dirty context

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index 69a4ec9ee8111750f8e506537200eeb0f9e91ee9..783376d7688dd744bd2abc9e0a29079bd1c5ff67 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -294,10 +294,10 @@ public:
     // take place at the GrDrawTarget level and this function implement faster copy paths. The rect
     // and point are pre-clipped. The src rect and implied dst rect are guaranteed to be within the
     // src/dst bounds and non-empty.
-    virtual bool copySurface(GrSurface* dst,
-                             GrSurface* src,
-                             const SkIRect& srcRect,
-                             const SkIPoint& dstPoint) = 0;
+    bool copySurface(GrSurface* dst,
+                     GrSurface* src,
+                     const SkIRect& srcRect,
+                     const SkIPoint& dstPoint);
 
     struct DrawArgs {
         DrawArgs(const GrPrimitiveProcessor* primProc,
@@ -482,6 +482,12 @@ private:
     // overridden by backend-specific derived class to perform the resolve
     virtual void onResolveRenderTarget(GrRenderTarget* target) = 0;
 
+    // overridden by backend specific derived class to perform the copy surface
+    virtual bool onCopySurface(GrSurface* dst,
+                               GrSurface* src,
+                               const SkIRect& srcRect,
+                               const SkIPoint& dstPoint) = 0;
+
     // width and height may be larger than rt (if underlying API allows it).
     // Should attach the SB to the RT. Returns false if compatible sb could
     // not be created.