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

device/vr/android/gvr/gvr_delegate.h

Index: device/vr/android/gvr/gvr_delegate.h
diff --git a/device/vr/android/gvr/gvr_delegate.h b/device/vr/android/gvr/gvr_delegate.h
index ed31de3388bd346dabdc6b2aff14ca2fb5d7ac7a..0491d756d1f5a6fd690ffac053345ac273c05f8e 100644
--- a/device/vr/android/gvr/gvr_delegate.h
+++ b/device/vr/android/gvr/gvr_delegate.h
@@ -12,15 +12,15 @@
 
 namespace device {
 
-constexpr gvr::Sizei kInvalidRenderTargetSize = {0, 0};
-
 class DEVICE_VR_EXPORT GvrDelegate {
  public:
   virtual void SetWebVRSecureOrigin(bool secure_origin) = 0;
-  virtual void SubmitWebVRFrame() = 0;
+  virtual void SubmitWebVRFrame(int16_t frame_index,
+                                const gpu::MailboxHolder& mailbox) = 0;
   virtual void UpdateWebVRTextureBounds(int16_t frame_index,
                                         const gvr::Rectf& left_bounds,
-                                        const gvr::Rectf& right_bounds) = 0;
+                                        const gvr::Rectf& right_bounds,
+                                        const gvr::Sizei& source_size) = 0;
   virtual void OnVRVsyncProviderRequest(
       mojom::VRVSyncProviderRequest request) = 0;
   virtual void UpdateVSyncInterval(int64_t timebase_nanos,
@@ -44,6 +44,7 @@ class DEVICE_VR_EXPORT GvrDelegateProvider {
   virtual void SetDeviceProvider(GvrDeviceProvider* device_provider) = 0;
   virtual void ClearDeviceProvider() = 0;
   virtual void RequestWebVRPresent(
+      mojom::VRSubmitFrameClientPtr submit_client,
       const base::Callback<void(bool)>& callback) = 0;
   virtual void ExitWebVRPresent() = 0;
   virtual GvrDelegate* GetDelegate() = 0;