Move prepareForExternalIO from GrRenderTarget to GrDrawContext

src/gpu/GrSurface.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrSurface.h"
 #include "GrContext.h"
 #include "GrSurfacePriv.h"
@@ skipping 131 matching lines @@
 
     return true;
 }
 
 void GrSurface::flushWrites() {
     if (!this->wasDestroyed()) {
         this->getContext()->flushSurfaceWrites(this);
     }
 }
 
-void GrSurface::prepareForExternalIO() {
-    if (!this->wasDestroyed()) {
-        this->getContext()->prepareSurfaceForExternalIO(this);
-    }
-}
-
 bool GrSurface::hasPendingRead() const {
     const GrTexture* thisTex = this->asTexture();
     if (thisTex && thisTex->internalHasPendingRead()) {
         return true;
     }
     const GrRenderTarget* thisRT = this->asRenderTarget();
     if (thisRT && thisRT->internalHasPendingRead()) {
         return true;
     }
     return false;
@@ skipping 25 matching lines @@
 
 void GrSurface::onRelease() {
     this->invokeReleaseProc();
     this->INHERITED::onRelease();
 }
 
 void GrSurface::onAbandon() {
     this->invokeReleaseProc();
     this->INHERITED::onAbandon();
 }