VR: System indicator rework.

chrome/browser/android/vr_shell/gl_browser_interface.h

 // Copyright 2017 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_GL_BROWSER_INTERFACE_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_GL_BROWSER_INTERFACE_H_
 
 #include <memory>
 
 #include "base/android/jni_weak_ref.h"
 #include "chrome/browser/android/vr_shell/ui_interface.h"
 #include "device/vr/android/gvr/gvr_gamepad_data_provider.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 blink {
 class WebInputEvent;
 }
 
 namespace vr_shell {
 
-// An interface for the GL thread to communicate with VrShell. Many of the
-// functions in this interface are proxies to methods on VrShell.
+// An interface for the GL thread to communicate with the rest of the system
+// (UI, VrShell, etc). Many of the functions in this interface are proxies to
+// methods on VrShell.
 class GlBrowserInterface {
  public:
   virtual ~GlBrowserInterface() = default;
 
   virtual void ContentSurfaceChanged(jobject surface) = 0;
   virtual void GvrDelegateReady(gvr::ViewerType viewer_type) = 0;
   virtual void UpdateGamepadData(device::GvrGamepadData) = 0;
   virtual void AppButtonGesturePerformed(UiInterface::Direction direction) = 0;
   virtual void AppButtonClicked() = 0;
   virtual void ProcessContentGesture(
       std::unique_ptr<blink::WebInputEvent> event) = 0;
   virtual void ForceExitVr() = 0;
   virtual void RunVRDisplayInfoCallback(
       const base::Callback<void(device::mojom::VRDisplayInfoPtr)>& callback,
       device::mojom::VRDisplayInfoPtr* info) = 0;
   virtual void OnContentPaused(bool enabled) = 0;
   virtual void ToggleCardboardGamepad(bool enabled) = 0;
+  virtual void OnGLInitialized() = 0;
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_GL_BROWSER_INTERFACE_H_