WebVR compositor bypass via BrowserMain context + mailbox

chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc

 // 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.
 
 #include "chrome/browser/android/vr_shell/non_presenting_gvr_delegate.h"
 
 #include <utility>
 
 #include "base/callback_helpers.h"
 #include "chrome/browser/android/vr_shell/vr_shell.h"
 #include "third_party/gvr-android-sdk/src/libraries/headers/vr/gvr/capi/include/gvr.h"
 
 namespace vr_shell {
 
 namespace {
 static constexpr int64_t kPredictionTimeWithoutVsyncNanos = 50000000;
 }  // namespace
 
 NonPresentingGvrDelegate::NonPresentingGvrDelegate(gvr_context* context)
     : task_runner_(base::ThreadTaskRunnerHandle::Get()),
       binding_(this),
       weak_ptr_factory_(this) {
   gvr_api_ = gvr::GvrApi::WrapNonOwned(context);
 }
 
 NonPresentingGvrDelegate::~NonPresentingGvrDelegate() {
   StopVSyncLoop();
 }
 
+void NonPresentingGvrDelegate::SubmitWebVRFrame(
+    int16_t frame_index,
+    const gpu::MailboxHolder& mailbox,
+    device::mojom::VRSubmitFrameClientPtr submit_client) {
+  submit_client->OnSubmitFrameTransferred();
+  submit_client->OnSubmitFrameRendered();
+}
+
 void NonPresentingGvrDelegate::OnVRVsyncProviderRequest(
     device::mojom::VRVSyncProviderRequest request) {
   binding_.Close();
   binding_.Bind(std::move(request));
   binding_.set_connection_error_handler(
       base::Bind(&NonPresentingGvrDelegate::StopVSyncLoop,
                  weak_ptr_factory_.GetWeakPtr()));
   StartVSyncLoop();
 }
 
@@ skipping 114 matching lines @@
 }
 
 void NonPresentingGvrDelegate::CreateVRDisplayInfo(
     const base::Callback<void(device::mojom::VRDisplayInfoPtr)>& callback,
     uint32_t device_id) {
   callback.Run(VrShell::CreateVRDisplayInfo(
       gvr_api_.get(), device::kInvalidRenderTargetSize, device_id));
 }
 
 }  // namespace vr_shell