Pause drawing webvr when the App button is pressed

chrome/browser/android/vr_shell/vr_shell_gl.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_SHELL_GL_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_GL_H_
 
 #include <memory>
 #include <queue>
 #include <utility>
@@ skipping 26 matching lines @@
 namespace gpu {
 struct MailboxHolder;
 }
 
 namespace vr_shell {
 
 class FPSMeter;
 class MailboxToSurfaceBridge;
 class UiScene;
 class VrController;
+class VrGLThread;
 class VrShell;
 class VrShellRenderer;
 struct UiElement;
 
 struct WebVrBounds {
   WebVrBounds(const gfx::RectF& left,
               const gfx::RectF& right,
               const gfx::Size& size)
       : left_bounds(left), right_bounds(right), source_size(size) {}
   gfx::RectF left_bounds;
   gfx::RectF right_bounds;
   gfx::Size source_size;
 };
 
 // This class manages all GLThread owned objects and GL rendering for VrShell.
 // It is not threadsafe and must only be used on the GL thread.
 class VrShellGl : public device::mojom::VRVSyncProvider {
  public:
   enum class InputTarget {
     NONE = 0,
     CONTENT,
   };
 
-  VrShellGl(const base::WeakPtr<VrShell>& weak_vr_shell,
-            scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner,
+  VrShellGl(const base::WeakPtr<VrGLThread>& weak_vr_gl_thread,
             gvr_context* gvr_api,
             bool initially_web_vr,
             bool reprojected_rendering,
             UiScene* scene);
   ~VrShellGl() override;
 
   void Initialize();
   void InitializeGl(gfx::AcceleratedWidget window);
 
   void OnTriggerEvent();
@@ skipping 136 matching lines @@
   base::TimeTicks vsync_timebase_;
   base::TimeDelta vsync_interval_;
 
   base::TimeDelta pending_time_;
   bool pending_vsync_ = false;
   GetVSyncCallback callback_;
   bool received_frame_ = false;
   mojo::Binding<device::mojom::VRVSyncProvider> binding_;
   device::mojom::VRSubmitFrameClientPtr submit_client_;
 
-  base::WeakPtr<VrShell> weak_vr_shell_;
-  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+  base::WeakPtr<VrGLThread> weak_vr_gl_thread_;
 
   UiScene* scene_ = nullptr;
 
   uint8_t frame_index_ = 0;
   // Larger than frame_index_ so it can be initialized out-of-band.
   uint16_t last_frame_index_ = -1;
 
   // Attributes for gesture detection while holding app button.
   gfx::Vector3dF controller_start_direction_;
 
   std::unique_ptr<FPSMeter> fps_meter_;
 
   gfx::Point3F pointer_start_;
 
   base::WeakPtrFactory<VrShellGl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShellGl);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_GL_H_