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

chrome/browser/android/vr_shell/non_presenting_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 CHROME_BROWSER_ANDROID_VR_SHELL_NON_PRESENTING_GVR_DELEGATE_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_NON_PRESENTING_GVR_DELEGATE_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 10 matching lines @@
 // A non presenting delegate for magic window mode.
 class NonPresentingGvrDelegate : public device::GvrDelegate,
                                  public device::mojom::VRVSyncProvider {
  public:
   explicit NonPresentingGvrDelegate(gvr_context* context);
 
   ~NonPresentingGvrDelegate() override;
 
   // GvrDelegate implementation
   void SetWebVRSecureOrigin(bool secure_origin) override {}
-  void SubmitWebVRFrame() override {}
+  void SubmitWebVRFrame(int16_t frame_index,
+                        const gpu::MailboxHolder& mailbox) 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,
                            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;
 
@@ skipping 23 matching lines @@
   GetVSyncCallback callback_;
   mojo::Binding<device::mojom::VRVSyncProvider> binding_;
   base::WeakPtrFactory<NonPresentingGvrDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NonPresentingGvrDelegate);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_NON_PRESENTING_GVR_DELEGATE_H_