WebVR compositor bypass via BrowserMain context + mailbox

third_party/WebKit/Source/modules/vr/VRDisplay.h

Index: third_party/WebKit/Source/modules/vr/VRDisplay.h
diff --git a/third_party/WebKit/Source/modules/vr/VRDisplay.h b/third_party/WebKit/Source/modules/vr/VRDisplay.h
index af955c5091b8593e17a0810ed81e71b42581ee3a..07e169809c5cbda73d180302fc44ca6735a90156 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.h
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.h
@@ -41,7 +41,8 @@ enum VREye { VREyeNone, VREyeLeft, VREyeRight };
 class VRDisplay final : public EventTargetWithInlineData,
                         public ActiveScriptWrappable<VRDisplay>,
                         public ContextLifecycleObserver,
-                        public device::mojom::blink::VRDisplayClient {
+                        public device::mojom::blink::VRDisplayClient,
+                        public device::mojom::blink::VRSubmitFrameClient {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(VRDisplay);
   USING_PRE_FINALIZER(VRDisplay, dispose);
@@ -116,7 +117,6 @@ class VRDisplay final : public EventTargetWithInlineData,
   VRController* controller();
 
  private:
-  void onFullscreenCheck(TimerBase*);
   void onPresentComplete(bool);
 
   void onConnected();
@@ -126,6 +126,10 @@ class VRDisplay final : public EventTargetWithInlineData,
 
   void OnPresentChange();
 
+  // VRSubmitFrameClient
+  void OnSubmitFrameTransferred();
+  void OnSubmitFrameRendered();
+
   // VRDisplayClient
   void OnChanged(device::mojom::blink::VRDisplayInfoPtr) override;
   void OnExitPresent() override;
@@ -162,24 +166,33 @@ class VRDisplay final : public EventTargetWithInlineData,
   double m_depthNear = 0.01;
   double m_depthFar = 10000.0;
 
+  // Current dimensions of the WebVR source canvas. May be different from
+  // the recommended renderWidth/Height if the client overrides dimensions.
+  int m_sourceWidth = 0;
+  int m_sourceHeight = 0;
+
   void dispose();
 
-  TaskRunnerTimer<VRDisplay> m_fullscreenCheckTimer;
-  String m_fullscreenOrigWidth;
-  String m_fullscreenOrigHeight;
   gpu::gles2::GLES2Interface* m_contextGL = nullptr;
   Member<WebGLRenderingContextBase> m_renderingContext;
 
+  // Used to keep the image alive until the next frame if using
+  // waitForPreviousTransferToFinish.
+  RefPtr<Image> m_previousImage;
+
   Member<ScriptedAnimationController> m_scriptedAnimationController;
   bool m_pendingRaf = false;
   bool m_pendingVsync = false;
   bool m_inAnimationFrame = false;
   bool m_displayBlurred = false;
-  bool m_reenteredFullscreen = false;
   double m_timebase = -1;
+  bool m_pendingPreviousFrameRender = false;
+  bool m_pendingSubmitFrame = false;
 
   device::mojom::blink::VRDisplayPtr m_display;
 
+  mojo::Binding<device::mojom::blink::VRSubmitFrameClient>
+      m_submit_frame_client_binding;
   mojo::Binding<device::mojom::blink::VRDisplayClient> m_displayClientBinding;
   device::mojom::blink::VRVSyncProviderPtr m_vrVSyncProvider;