WebVR compositor bypass via BrowserMain context + mailbox

chrome/browser/android/vr_shell/vr_shell.cc

Index: chrome/browser/android/vr_shell/vr_shell.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell.cc b/chrome/browser/android/vr_shell/vr_shell.cc
index ab3b67ac4529a57e6708f2c6ea1ef9543128f90a..5c1a15db2154610fc4861d439cb3fb031837918c 100644
--- a/chrome/browser/android/vr_shell/vr_shell.cc
+++ b/chrome/browser/android/vr_shell/vr_shell.cc
@@ -36,6 +36,7 @@
 #include "content/public/common/referrer.h"
 #include "device/vr/android/gvr/gvr_device.h"
 #include "device/vr/android/gvr/gvr_device_provider.h"
+#include "gpu/command_buffer/common/mailbox.h"
 #include "jni/VrShellImpl_jni.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/android/view_android.h"
@@ -324,14 +325,57 @@ void VrShell::SetWebVRSecureOrigin(bool secure_origin) {
   html_interface_->SetWebVRSecureOrigin(secure_origin);
 }
 
-void VrShell::SubmitWebVRFrame() {}
+void VrShell::SubmitWebVRFrame(
+    int16_t frame_index,
+    const gpu::MailboxHolder& mailbox,
+    device::mojom::VRSubmitFrameClientPtr submit_client) {
+  TRACE_EVENT1("gpu", "SubmitWebVRFrame", "frame", frame_index);
+
+  // Save the submit completion client for later, we'll call the
+  // next lifecycle stages on it later. Use extra boolean maps
+  // to track when they get called since they could potentially
+  // be out of order, do cleanup once both were called.
+  webvr_submit_clients_.insert(
+      std::make_pair(frame_index, std::move(submit_client)));
+  webvr_submit_client_transferring_.insert({frame_index, true});
+  webvr_submit_client_rendering_.insert({frame_index, true});
+
+  PostToGlThreadWhenReady(base::Bind(&VrShellGl::SubmitWebVRFrame,
+                                     gl_thread_->GetVrShellGl(), frame_index,
+                                     mailbox));
+}
+
+void VrShell::OnSubmitWebVRFrameTransferred(int frame_index) {
+  DCHECK(webvr_submit_clients_.find(frame_index) !=
+         webvr_submit_clients_.end());
+  webvr_submit_clients_[frame_index]->OnSubmitFrameTransferred();
+  webvr_submit_client_transferring_[frame_index] = false;
+  if (!webvr_submit_client_rendering_[frame_index]) {
+    webvr_submit_clients_.erase(frame_index);
+    webvr_submit_client_transferring_.erase(frame_index);
+    webvr_submit_client_rendering_.erase(frame_index);
+  }
+}
+
+void VrShell::OnSubmitWebVRFrameRendered(int frame_index) {
+  DCHECK(webvr_submit_clients_.find(frame_index) !=
+         webvr_submit_clients_.end());
+  webvr_submit_clients_[frame_index]->OnSubmitFrameRendered();
+  webvr_submit_client_rendering_[frame_index] = false;
+  if (!webvr_submit_client_transferring_[frame_index]) {
+    webvr_submit_clients_.erase(frame_index);
+    webvr_submit_client_transferring_.erase(frame_index);
+    webvr_submit_client_rendering_.erase(frame_index);
+  }
+}
 
 void VrShell::UpdateWebVRTextureBounds(int16_t frame_index,
                                        const gvr::Rectf& left_bounds,
-                                       const gvr::Rectf& right_bounds) {
+                                       const gvr::Rectf& right_bounds,
+                                       const gvr::Sizei& source_size) {
   PostToGlThreadWhenReady(base::Bind(&VrShellGl::UpdateWebVRTextureBounds,
                                      gl_thread_->GetVrShellGl(), frame_index,
-                                     left_bounds, right_bounds));
+                                     left_bounds, right_bounds, source_size));
 }
 
 bool VrShell::SupportsPresentation() {
@@ -623,7 +667,7 @@ device::mojom::VRPosePtr VrShell::VRPosePtrFromGvrPose(gvr::Mat4f head_mat) {
 
 device::mojom::VRDisplayInfoPtr VrShell::CreateVRDisplayInfo(
     gvr::GvrApi* gvr_api,
-    gvr::Sizei compositor_size,
+    gvr::Sizei recommended_size,
     uint32_t device_id) {
   TRACE_EVENT0("input", "GvrDevice::GetVRDevice");
 
@@ -652,8 +696,8 @@ device::mojom::VRDisplayInfoPtr VrShell::CreateVRDisplayInfo(
         (eye == GVR_LEFT_EYE) ? device->leftEye : device->rightEye;
     eye_params->fieldOfView = device::mojom::VRFieldOfView::New();
     eye_params->offset.resize(3);
-    eye_params->renderWidth = compositor_size.width / 2;
-    eye_params->renderHeight = compositor_size.height;
+    eye_params->renderWidth = recommended_size.width / 2;
+    eye_params->renderHeight = recommended_size.height;
 
     gvr::BufferViewport eye_viewport = gvr_api->CreateBufferViewport();
     gvr_buffer_viewports.GetBufferViewport(eye, &eye_viewport);