WebVR compositor bypass via BrowserMain context + mailbox

chrome/browser/android/vr_shell/vr_shell.h

Index: chrome/browser/android/vr_shell/vr_shell.h
diff --git a/chrome/browser/android/vr_shell/vr_shell.h b/chrome/browser/android/vr_shell/vr_shell.h
index deb1f1fefdd8dffe017701b027c1dfb4aff4c912..751207af22fa37fcb1a9e1a62511f64d429ef789 100644
--- a/chrome/browser/android/vr_shell/vr_shell.h
+++ b/chrome/browser/android/vr_shell/vr_shell.h
@@ -32,6 +32,10 @@ namespace content {
 class WebContents;
 }
 
+namespace gpu {
+struct MailboxHolder;
+}
+
 namespace ui {
 class WindowAndroid;
 }
@@ -169,8 +173,10 @@ class VrShell : public device::GvrDelegate, content::WebContentsObserver {
   static device::mojom::VRPosePtr VRPosePtrFromGvrPose(gvr::Mat4f head_mat);
   static device::mojom::VRDisplayInfoPtr CreateVRDisplayInfo(
       gvr::GvrApi* gvr_api,
-      gvr::Sizei compositor_size,
+      gvr::Sizei recommended_size,
       uint32_t device_id);
+  void OnSubmitWebVRFrameTransferred(int frame_index);
+  void OnSubmitWebVRFrameRendered(int frame_index);
 
  private:
   ~VrShell() override;
@@ -186,10 +192,14 @@ class VrShell : public device::GvrDelegate, content::WebContentsObserver {
 
   // device::GvrDelegate implementation
   void SetWebVRSecureOrigin(bool secure_origin) override;
-  void SubmitWebVRFrame() override;
+  void SubmitWebVRFrame(
+      int16_t frame_index,
+      const gpu::MailboxHolder& mailbox,
+      device::mojom::VRSubmitFrameClientPtr submit_client) override;
   void UpdateWebVRTextureBounds(int16_t frame_index,
                                 const gvr::Rectf& left_bounds,
-                                const gvr::Rectf& right_bounds) override;
+                                const gvr::Rectf& right_bounds,
+                                const gvr::Sizei& source_size) override;
   void OnVRVsyncProviderRequest(
       device::mojom::VRVSyncProviderRequest request) override;
   void UpdateVSyncInterval(int64_t timebase_nanos,
@@ -207,6 +217,9 @@ class VrShell : public device::GvrDelegate, content::WebContentsObserver {
   std::unique_ptr<UiInterface> html_interface_;
   bool content_paused_ = false;
   bool webvr_mode_ = false;
+  std::map<int, device::mojom::VRSubmitFrameClientPtr> webvr_submit_clients_;
+  std::map<int, bool> webvr_submit_client_transferring_;
+  std::map<int, bool> webvr_submit_client_rendering_;
 
   content::WebContents* main_contents_ = nullptr;
   base::android::ScopedJavaGlobalRef<jobject> j_motion_event_synthesizer_;