viz: Use a simple GpuMemoryBufferManager implementation.

components/viz/service/display_compositor/in_process_gpu_memory_buffer_manager.h

+// Copyright 2017 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_VIZ_SERVICE_DISPLAY_COMPOSITOR_IN_PROCESS_GPU_MEMORY_BUFFER_MANAGER_H_
+#define COMPONENTS_VIZ_SERVICE_DISPLAY_COMPOSITOR_IN_PROCESS_GPU_MEMORY_BUFFER_MANAGER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
+#include "gpu/ipc/service/gpu_memory_buffer_factory.h"
+
+namespace gpu {
+class GpuChannelManager;
+}
+
+namespace viz {
+
+class InProcessGpuMemoryBufferManager : public gpu::GpuMemoryBufferManager {
+ public:
+  explicit InProcessGpuMemoryBufferManager(
+      gpu::GpuChannelManager* channel_manager);
+
+  ~InProcessGpuMemoryBufferManager() override;
+
+ private:
+  void DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
+                              int client_id,
+                              const gpu::SyncToken& sync_token);
+  // gpu::GpuMemoryBufferManager:
+  std::unique_ptr<gfx::GpuMemoryBuffer> CreateGpuMemoryBuffer(

[reveman, 2017/06/20 18:22:07]

nit: why not public? it's public to anyone with a gpu::GpuMemoryBufferManager*
to this instance so making it private here is confusing imo

[sadrul, 2017/06/21 05:57:46]

Made these public.

+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      gfx::BufferUsage usage,
+      gpu::SurfaceHandle surface_handle) override;
+  void SetDestructionSyncToken(gfx::GpuMemoryBuffer* buffer,
+                               const gpu::SyncToken& sync_token) override;
+
+  const int client_id_;
+  int next_gpu_memory_id_ = 1;
+  gpu::GpuChannelManager* channel_manager_;
+  base::WeakPtr<InProcessGpuMemoryBufferManager> weak_ptr_;
+  base::WeakPtrFactory<InProcessGpuMemoryBufferManager> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(InProcessGpuMemoryBufferManager);
+};
+
+}  // namespace viz
+
+#endif  // COMPONENTS_VIZ_SERVICE_DISPLAY_COMPOSITOR_IN_PROCESS_GPU_MEMORY_BUFFER_MANAGER_H_