Pause drawing webvr when the App button is pressed

chrome/browser/android/vr_shell/vr_shell.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_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 109 matching lines @@
 
   void ContentWebContentsDestroyed();
   // Called when our WebContents have been hidden. Usually a sign that something
   // like another tab placed in front of it.
   void ContentWasHidden();
   void ContentWasShown();
 
   void ContentSurfaceChanged(jobject surface);
   void GvrDelegateReady();
   void AppButtonGesturePerformed(UiInterface::Direction direction);
-  void AppButtonPressed();
+  void AppButtonPressed(bool content_paused);
 
   void ContentPhysicalBoundsChanged(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& object,
       jint width,
       jint height,
       jfloat dpr);
 
   // Perform a UI action triggered by the javascript API.
   void DoUiAction(const UiAction action,
                   const base::DictionaryValue* arguments);
 
   void SetContentCssSize(float width, float height, float dpr);
 
   void ContentFrameWasResized(bool width_changed);
 
   void ForceExitVr();
 
   void ProcessContentGesture(std::unique_ptr<blink::WebInputEvent> event);
   void SubmitControllerModel(std::unique_ptr<VrControllerModel> model);
 
   // device::GvrGamepadDataProvider implementation.
   void UpdateGamepadData(device::GvrGamepadData) override;
   void RegisterGamepadDataFetcher(device::GvrGamepadDataFetcher*) override;
 
  private:
   ~VrShell() override;
   void PostToGlThreadWhenReady(const base::Closure& task);
-  void SetContentPaused(bool paused);
+  void OnContentPaused(bool paused);
   void SetUiState();
 
   // device::GvrDelegate implementation.
   void SetWebVRSecureOrigin(bool secure_origin) override;
   void SubmitWebVRFrame(int16_t frame_index,
                         const gpu::MailboxHolder& mailbox) override;
   void UpdateWebVRTextureBounds(int16_t frame_index,
                                 const gfx::RectF& left_bounds,
                                 const gfx::RectF& right_bounds,
                                 const gfx::Size& source_size) override;
   void OnVRVsyncProviderRequest(
       device::mojom::VRVSyncProviderRequest request) override;
   void UpdateVSyncInterval(int64_t timebase_nanos,
                            double interval_seconds) override;
   void CreateVRDisplayInfo(
       const base::Callback<void(device::mojom::VRDisplayInfoPtr)>& callback,
       uint32_t device_id) override;
 
   // device::PresentingGvrDelegate implementation.
   void SetSubmitClient(
       device::mojom::VRSubmitFrameClientPtr submit_client) override;
 
   void ProcessTabArray(JNIEnv* env, jobjectArray tabs, bool incognito);
 
   bool vr_shell_enabled_;
 
   std::unique_ptr<UiInterface> ui_;
   bool content_paused_ = false;

[bshe, 2017/04/21 21:08:42]

nit: remove this too?

[ymalik, 2017/04/28 00:12:04]

Done.

   bool webvr_mode_ = false;
 
   content::WebContents* web_contents_ = nullptr;
   base::android::ScopedJavaGlobalRef<jobject> j_motion_event_synthesizer_;
   ui::WindowAndroid* window_;
   std::unique_ptr<VrCompositor> compositor_;
 
   std::unique_ptr<VrWebContentsObserver> vr_web_contents_observer_;
 
   VrShellDelegate* delegate_provider_ = nullptr;
@@ skipping 22 matching lines @@
   base::WeakPtrFactory<VrShell> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShell);
 };
 
 bool RegisterVrShell(JNIEnv* env);
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_