[Reland 2] Pepper takes ownership of a mailbox before passing it to the texture layer.

components/mus/gles2/command_buffer_impl.h

 // Copyright 2014 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 COMPONENTS_MUS_GLES2_COMMAND_BUFFER_IMPL_H_
 #define COMPONENTS_MUS_GLES2_COMMAND_BUFFER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 49 matching lines @@
                    mojo::ScopedHandle memory_handle,
                    int32_t type,
                    mojo::SizePtr size,
                    int32_t format,
                    int32_t internal_format) override;
   void DestroyImage(int32_t id) override;
   void CreateStreamTexture(
       uint32_t client_texture_id,
       const mojom::CommandBuffer::CreateStreamTextureCallback& callback
       ) override;
-  void ProduceFrontBuffer(const gpu::Mailbox& mailbox) override;
+  void TakeFrontBuffer(const gpu::Mailbox& mailbox) override;
+  void ReturnFrontBuffer(const gpu::Mailbox& mailbox, bool is_lost) override;
   void SignalQuery(uint32_t query, uint32_t signal_id) override;
   void SignalSyncToken(const gpu::SyncToken& sync_token,
                        uint32_t signal_id) override;
   void WaitForGetOffsetInRange(
       int32_t start, int32_t end,
       const mojom::CommandBuffer::WaitForGetOffsetInRangeCallback& callback
       ) override;
   void WaitForTokenInRange(
       int32_t start, int32_t end,
       const mojom::CommandBuffer::WaitForGetOffsetInRangeCallback& callback
@@ skipping 34 matching lines @@
   std::unique_ptr<CommandBufferDriver> driver_;
   std::unique_ptr<mojo::Binding<CommandBuffer>> binding_;
   mojom::CommandBufferClientPtr client_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferImpl);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_GLES2_COMMAND_BUFFER_IMPL_H_