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

device/vr/android/gvr/gvr_device_provider.h

Index: device/vr/android/gvr/gvr_device_provider.h
diff --git a/device/vr/android/gvr/gvr_device_provider.h b/device/vr/android/gvr/gvr_device_provider.h
index 5793021566859838b80056bb5871fdc0cc82756f..d215e603b89730283de7f327e089ddcef9d5996d 100644
--- a/device/vr/android/gvr/gvr_device_provider.h
+++ b/device/vr/android/gvr/gvr_device_provider.h
@@ -11,9 +11,11 @@
 #include "base/macros.h"
 #include "device/vr/vr_device_provider.h"
 #include "device/vr/vr_export.h"
+#include "device/vr/vr_service.mojom.h"
 
 namespace device {
 
+class GvrDelegateProvider;
 class GvrDevice;
 
 class DEVICE_VR_EXPORT GvrDeviceProvider : public VRDeviceProvider {
@@ -27,14 +29,17 @@ class DEVICE_VR_EXPORT GvrDeviceProvider : public VRDeviceProvider {
   void SetListeningForActivate(bool listening) override;
 
   // Called from GvrDevice.
-  void RequestPresent(const base::Callback<void(bool)>& callback);
+  void RequestPresent(mojom::VRSubmitFrameClientPtr submit_client,
+                      const base::Callback<void(bool)>& callback);
   void ExitPresent();
 
+  device::GvrDelegateProvider* GetDelegateProvider();
+
   GvrDevice* Device() { return vr_device_.get(); }
 
  private:
+  void Initialize(device::GvrDelegateProvider* provider);
   std::unique_ptr<GvrDevice> vr_device_;
-  bool initialized_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(GvrDeviceProvider);
 };