Re-land^2 WebVR compositor bypass via BrowserMain context + mailbox

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 151 matching lines @@
 
   void ProcessUIGesture(std::unique_ptr<blink::WebInputEvent> event);
   void ProcessContentGesture(std::unique_ptr<blink::WebInputEvent> event);
 
   // TODO(mthiesse): Find a better place for these functions to live.
   static device::mojom::VRPosePtr VRPosePtrFromGvrPose(gvr::Mat4f head_mat);
   static device::mojom::VRDisplayInfoPtr CreateVRDisplayInfo(
       gvr::GvrApi* gvr_api,
       gvr::Sizei compositor_size,
       uint32_t device_id);
+  void OnSubmitWebVRFrameTransferred(int frame_index);
+  void OnSubmitWebVRFrameRendered(int frame_index);
 
  private:
   ~VrShell() override;
   void PostToGlThreadWhenReady(const base::Closure& task);
   void SetContentPaused(bool paused);
   void SetUiState();
 
   // content::WebContentsObserver implementation.
   void RenderViewHostChanged(content::RenderViewHost* old_host,
                              content::RenderViewHost* new_host) override;
   void MainFrameWasResized(bool width_changed) override;
   void WebContentsDestroyed() override;
 
   // device::GvrDelegate implementation
   void SetWebVRSecureOrigin(bool secure_origin) override;
-  void SubmitWebVRFrame() override;
+  void SubmitWebVRFrame(
+      int frame_index, const gpu::Mailbox& mailbox,
+      device::mojom::VRSubmitFrameClientPtr submit_client) override;
   void UpdateWebVRTextureBounds(int16_t frame_index,
                                 const gvr::Rectf& left_bounds,
                                 const gvr::Rectf& right_bounds) override;
   void OnVRVsyncProviderRequest(
       device::mojom::VRVSyncProviderRequest request) override;
   void UpdateVSyncInterval(int64_t timebase_nanos,
                            double interval_seconds) override;
   bool SupportsPresentation() override;
   void ResetPose() override;
   void CreateVRDisplayInfo(
       const base::Callback<void(device::mojom::VRDisplayInfoPtr)>& callback,
       uint32_t device_id) override;
 
   void ProcessTabArray(JNIEnv* env, jobjectArray tabs, bool incognito);
 
   bool vr_shell_enabled_;
 
   std::unique_ptr<UiInterface> html_interface_;
   bool content_paused_ = false;
   bool webvr_mode_ = false;
+  int webvr_surface_handle_;
+  int webvr_frames_in_surface_queue_ = 0;
+  device::mojom::VRSubmitFrameClientPtr webvr_submit_client_transferring_;
+  device::mojom::VRSubmitFrameClientPtr webvr_submit_client_rendering_;
 
   content::WebContents* main_contents_ = nullptr;
   base::android::ScopedJavaGlobalRef<jobject> j_motion_event_synthesizer_;
   ui::WindowAndroid* content_window_;
   std::unique_ptr<VrCompositor> content_compositor_;
   content::WebContents* ui_contents_;
   std::unique_ptr<VrCompositor> ui_compositor_;
 
   std::unique_ptr<VrWebContentsObserver> vr_web_contents_observer_;
 
@@ skipping 18 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_