Revert of Move copy-surface-as-draw fallback to GrGLGpu.

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index e8d493930490c07dc28fdc2dc7093cc677fa51c6..f2ad10f41714c6faf9beb947eed234025b20677e 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -256,6 +256,16 @@
                                   const GrPrimitiveProcessor&,
                                   const GrPipeline&,
                                   const GrBatchTracker&) const = 0;
+
+    // Called to determine whether a copySurface call would succeed or not. Derived
+    // classes must keep this consistent with their implementation of onCopySurface(). Fallbacks
+    // to issuing a draw from the src to dst take place at the GrDrawTarget level and this function
+    // should only return true if a faster copy path exists. 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 canCopySurface(const GrSurface* dst,
+                                const GrSurface* src,
+                                const SkIRect& srcRect,
+                                const SkIPoint& dstPoint) = 0;
 
     // Called to perform a surface to surface copy. Fallbacks to issuing a draw from the src to dst
     // take place at the GrDrawTarget level and this function implement faster copy paths. The rect