Implemented StructTraits for cc::CopyOutputResult

cc/output/copy_output_result.h

 // 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.
 
 #ifndef CC_OUTPUT_COPY_OUTPUT_RESULT_H_
 #define CC_OUTPUT_COPY_OUTPUT_RESULT_H_
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "cc/base/cc_export.h"
 #include "cc/resources/single_release_callback.h"
 #include "cc/resources/texture_mailbox.h"
+#include "mojo/public/cpp/bindings/struct_traits.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/geometry/size.h"
 
 class SkBitmap;
 
 namespace cc {
+
+namespace mojom {
+class CopyOutputResultDataView;
+}
+
 class TextureMailbox;
 
 class CC_EXPORT CopyOutputResult {
  public:
   static std::unique_ptr<CopyOutputResult> CreateEmptyResult() {
     return base::WrapUnique(new CopyOutputResult);
   }
   static std::unique_ptr<CopyOutputResult> CreateBitmapResult(
       std::unique_ptr<SkBitmap> bitmap) {
     return base::WrapUnique(new CopyOutputResult(std::move(bitmap)));
   }
   static std::unique_ptr<CopyOutputResult> CreateTextureResult(
       const gfx::Size& size,
       const TextureMailbox& texture_mailbox,
       std::unique_ptr<SingleReleaseCallback> release_callback) {
     return base::WrapUnique(new CopyOutputResult(size, texture_mailbox,
                                                  std::move(release_callback)));
   }
 
+  CopyOutputResult();
+
+  CopyOutputResult(CopyOutputResult&& other);
+
   ~CopyOutputResult();
 
+  CopyOutputResult& operator=(CopyOutputResult&& other);
+
   bool IsEmpty() const { return !HasBitmap() && !HasTexture(); }
-  bool HasBitmap() const { return !!bitmap_; }
+  bool HasBitmap() const { return !!bitmap_ && !bitmap_->isNull(); }
   bool HasTexture() const { return texture_mailbox_.IsValid(); }
 
   gfx::Size size() const { return size_; }
   std::unique_ptr<SkBitmap> TakeBitmap();
   void TakeTexture(TextureMailbox* texture_mailbox,
                    std::unique_ptr<SingleReleaseCallback>* release_callback);
 
  private:
-  CopyOutputResult();
+  friend struct mojo::StructTraits<mojom::CopyOutputResultDataView,
+                                   CopyOutputResult>;
+
   explicit CopyOutputResult(std::unique_ptr<SkBitmap> bitmap);
   explicit CopyOutputResult(
       const gfx::Size& size,
       const TextureMailbox& texture_mailbox,
       std::unique_ptr<SingleReleaseCallback> release_callback);
 
   gfx::Size size_;
   std::unique_ptr<SkBitmap> bitmap_;
   TextureMailbox texture_mailbox_;
   std::unique_ptr<SingleReleaseCallback> release_callback_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_COPY_OUTPUT_RESULT_H_