cc: Allow output readback/copy requests to specify a sub-rect to copy.

cc/output/copy_output_request.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/copy_output_request.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/resources/texture_mailbox.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace cc {
 
 CopyOutputRequest::CopyOutputRequest() {}
 
 CopyOutputRequest::CopyOutputRequest(
     bool force_bitmap_result,
     const CopyOutputRequestCallback& result_callback)
     : force_bitmap_result_(force_bitmap_result),
+      has_area_(false),
       result_callback_(result_callback) {
 }
 
 CopyOutputRequest::~CopyOutputRequest() {
   if (!result_callback_.is_null())
     SendResult(CopyOutputResult::CreateEmptyResult().Pass());
 }
 
 void CopyOutputRequest::SendResult(scoped_ptr<CopyOutputResult> result) {
   base::ResetAndReturn(&result_callback_).Run(result.Pass());
 }
 
 void CopyOutputRequest::SendBitmapResult(scoped_ptr<SkBitmap> bitmap) {
   SendResult(CopyOutputResult::CreateBitmapResult(bitmap.Pass()).Pass());
 }
 
 void CopyOutputRequest::SendTextureResult(gfx::Size size,
                                           scoped_ptr<TextureMailbox> texture) {
   DCHECK(texture->IsTexture());
   SendResult(CopyOutputResult::CreateTextureResult(size,
                                                    texture.Pass()).Pass());
 }
 
 }  // namespace cc