Implement WebVR presentation pausing for VR Shell Menu Mode

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>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/android/vr_shell/vr_math.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "device/vr/android/gvr/gvr_delegate.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "third_party/gvr-android-sdk/src/ndk/include/vr/gvr/capi/include/gvr.h"
 #include "third_party/gvr-android-sdk/src/ndk/include/vr/gvr/capi/include/gvr_types.h"
 
 using blink::WebInputEvent;
 
@@ skipping 89 matching lines @@
   void QueueTask(base::Callback<void()>& callback);
 
   // Perform a UI action triggered by the javascript API.
   void DoUiAction(const UiAction action);
 
  private:
   ~VrShell() override;
   void LoadUIContent();
   void DrawVrShell(const gvr::Mat4f& head_pose, gvr::Frame &frame);
   void DrawUiView(const gvr::Mat4f* head_pose,
-                  const std::vector<const ContentRectangle*>& elements);
+                  const std::vector<const ContentRectangle*>& elements,
+                  bool clear);
   void DrawElements(const gvr::Mat4f& render_matrix,
                     const std::vector<const ContentRectangle*>& elements);
   void DrawCursor(const gvr::Mat4f& render_matrix);
   void DrawWebVr();
 
   void UpdateController(const gvr::Vec3f& forward_vector);
   void SendEventsToTarget(VrInputManager* input_target,
                           int pixel_x,
                           int pixel_y);
 
@@ skipping 15 matching lines @@
   std::unique_ptr<gvr::BufferViewportList> buffer_viewport_list_;
   std::unique_ptr<gvr::BufferViewport> buffer_viewport_;
   std::unique_ptr<gvr::BufferViewport> headlocked_left_viewport_;
   std::unique_ptr<gvr::BufferViewport> headlocked_right_viewport_;
   std::unique_ptr<gvr::SwapChain> swap_chain_;
 
   gvr::Sizei render_size_;
 
   std::queue<base::Callback<void()>> task_queue_;
   base::Lock task_queue_lock_;
+  base::Lock gvr_init_lock_;
 
   std::unique_ptr<VrCompositor> content_compositor_;
   content::WebContents* main_contents_;
   std::unique_ptr<VrCompositor> ui_compositor_;
   content::WebContents* ui_contents_;
   std::unique_ptr<VrWebContentsObserver> vr_web_contents_observer_;
 
   VrShellDelegate* delegate_ = nullptr;
   std::unique_ptr<VrShellRenderer> vr_shell_renderer_;
   base::android::ScopedJavaGlobalRef<jobject> j_vr_shell_;
@@ skipping 14 matching lines @@
   // The pose ring buffer size must be a power of two to avoid glitches when
   // the pose index wraps around. It should be large enough to handle the
   // current backlog of poses which is 2-3 frames.
   static constexpr int kPoseRingBufferSize = 8;
   std::vector<gvr::Mat4f> webvr_head_pose_;
 
   std::unique_ptr<VrController> controller_;
   scoped_refptr<VrInputManager> content_input_manager_;
   scoped_refptr<VrInputManager> ui_input_manager_;
 
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+
   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_