Implement new compositor and ContentViewCore reparenting for VR Shell.

chrome/browser/android/vr_shell/vr_compositor.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 CHROME_BROWSER_ANDROID_VR_SHELL_VR_COMPOSITOR_H_
+#define CHROME_BROWSER_ANDROID_VR_SHELL_VR_COMPOSITOR_H_
+
+#include <memory>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "content/public/browser/android/compositor_client.h"
+
+namespace cc {
+class Layer;
+}
+
+namespace content {
+class Compositor;
+class ContentViewCore;
+}
+
+namespace ui {
+class WindowAndroid;
+}
+
+namespace vr_shell {
+
+class VrCompositor : public content::CompositorClient {
+ public:
+  explicit VrCompositor(ui::WindowAndroid* window);
+  ~VrCompositor() override;
+
+  void SurfaceDestroyed();
+  void SurfaceChanged(int width,
+                      int height,
+                      const base::android::JavaParamRef<jobject>& surface);
+  void SetLayer(content::ContentViewCore* core);
+
+  // CompositorClient implementation:
+  void UpdateLayerTreeHost() override;
+  void OnSwapBuffersCompleted(int pending_swap_buffers) override;
+
+ private:
+  std::unique_ptr<content::Compositor> compositor_;
+
+  cc::Layer* layer_ = nullptr;
+  cc::Layer* layer_parent_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(VrCompositor);
+};
+
+}  // namespace vr_shell
+
+#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_COMPOSITOR_H_