Move prepareForExternalIO from GrRenderTarget to GrDrawContext

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "GrBlurUtils.h"
@@ skipping 1709 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkGpuDevice::onShouldDisableLCD(const SkPaint& paint) const {
     return GrTextUtils::ShouldDisableLCD(paint);
 }
 
 void SkGpuDevice::flush() {
     ASSERT_SINGLE_OWNER
 
-    fRenderTarget->prepareForExternalIO();
+    fDrawContext->prepareForExternalIO();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkBaseDevice* SkGpuDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint*) {
     ASSERT_SINGLE_OWNER
 
     SkSurfaceProps props(this->surfaceProps().flags(), cinfo.fPixelGeometry);
 
     // layers are never drawn in repeat modes, so we can request an approx
@@ skipping 32 matching lines @@
 }
 
 SkImageFilterCache* SkGpuDevice::getImageFilterCache() {
     ASSERT_SINGLE_OWNER
     // We always return a transient cache, so it is freed after each
     // filter traversal.
     return SkImageFilterCache::Create(kDefaultImageFilterCacheSize);
 }
 
 #endif