Use blitframebuffer to implement copySurface.

src/gpu/gl/GrGLIRect.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #ifndef GrGLIRect_DEFINED
@@ skipping 18 matching lines @@
 
     void pushToGLScissor(const GrGLInterface* gl) const {
         GR_GL_CALL(gl, Scissor(fLeft, fBottom, fWidth, fHeight));
     }
 
     void setFromGLViewport(const GrGLInterface* gl) {
         GR_STATIC_ASSERT(sizeof(GrGLIRect) == 4*sizeof(GrGLint));
         GR_GL_GetIntegerv(gl, GR_GL_VIEWPORT, (GrGLint*) this);
     }
 
-    // sometimes we have a GrIRect from the client that we
+    // sometimes we have a SkIRect from the client that we
     // want to simultaneously make relative to GL's viewport
     // and (optionally) convert from top-down to bottom-up.
     void setRelativeTo(const GrGLIRect& glRect,
                        int leftOffset,
                        int topOffset,
                        int width,
                        int height,
                        GrSurfaceOrigin origin) {
         fLeft = glRect.fLeft + leftOffset;
         fWidth = width;
@@ skipping 20 matching lines @@
     void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;}
 
     bool operator ==(const GrGLIRect& glRect) const {
         return 0 == memcmp(this, &glRect, sizeof(GrGLIRect));
     }
 
     bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);}
 };
 
 #endif