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

device/vr/android/gvr/gvr_delegate.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 DEVICE_VR_ANDROID_GVR_DELEGATE_H
 #define DEVICE_VR_ANDROID_GVR_DELEGATE_H
 
 #include "device/vr/android/gvr/gvr_device_provider.h"
 #include "device/vr/vr_export.h"
 #include "device/vr/vr_service.mojom.h"
 #include "third_party/gvr-android-sdk/src/libraries/headers/vr/gvr/capi/include/gvr_types.h"
 
 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,
                                    double interval_seconds) = 0;
   virtual bool SupportsPresentation() = 0;
   virtual void ResetPose() = 0;
   virtual void CreateVRDisplayInfo(
       const base::Callback<void(mojom::VRDisplayInfoPtr)>& callback,
       uint32_t device_id) = 0;
 
  protected:
   virtual ~GvrDelegate() {}
 };
 
 class DEVICE_VR_EXPORT GvrDelegateProvider {
  public:
   static void SetInstance(
       const base::Callback<GvrDelegateProvider*()>& provider_callback);
   static GvrDelegateProvider* GetInstance();
 
   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;
   virtual void SetListeningForActivate(bool listening) = 0;
 
  protected:
   virtual ~GvrDelegateProvider() {}
 
  private:
   static base::Callback<GvrDelegateProvider*()> delegate_provider_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_VR_ANDROID_GVR_DELEGATE_H