Added the Vulkan Context Provider implementation.

cc/output/vulkan_derived_context_provider.h

+// Copyright 2016 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_VULKAN_DERIVED_CONTEXT_PROVIDER_H_
+#define CC_OUTPUT_VULKAN_DERIVED_CONTEXT_PROVIDER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "cc/base/cc_export.h"
+#include "cc/output/vulkan_context_provider.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace gpu {
+class VulkanDeviceQueue;
+class VulkanSurface;
+}
+
+namespace cc {
+
+class CC_EXPORT VulkanDerivedContextProvider : public VulkanContextProvider {

[piman, 2016/04/19 01:36:42]

I don't think this class is that useful. cc won't call SwapBuffers directly on
the ContextProvider, it will go through the OutputSurface. So you could have the
VulkanBrowserCompositorOutputSurface own the VulkanSurface, and call SwapBuffers
on it directly.

[David Yen, 2016/04/19 22:20:27]

Ok. I have removed VulkanDerivedContextProvider and also the SwapBuffers()
function from VulkanContextProvider.

+ public:
+  static scoped_refptr<VulkanDerivedContextProvider> Create(
+      scoped_refptr<VulkanContextProvider> parent_context_provider,
+      gfx::AcceleratedWidget widget);
+
+  bool Initialize();
+  void Destroy();
+
+  gpu::VulkanDeviceQueue* GetDeviceQueue() override;
+  void SwapBuffers() override;
+
+ protected:
+  VulkanDerivedContextProvider(
+      scoped_refptr<VulkanContextProvider> parent_context_provider,
+      gfx::AcceleratedWidget widget);
+  ~VulkanDerivedContextProvider() override;
+
+ private:
+  scoped_refptr<VulkanContextProvider> parent_context_provider_;
+  scoped_ptr<gpu::VulkanSurface> surface_;
+
+  DISALLOW_COPY_AND_ASSIGN(VulkanDerivedContextProvider);
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_VULKAN_DERIVED_CONTEXT_PROVIDER_H_