VR: Make sure GL thread is started before binding callbacks to it.

chrome/browser/android/vr_shell/vr_shell.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_VR_SHELL_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 148 matching lines @@
 
   void ProcessContentGesture(std::unique_ptr<blink::WebInputEvent> event);
   void SubmitControllerModel(std::unique_ptr<VrControllerModel> model);
 
   // device::GvrGamepadDataProvider implementation.
   void UpdateGamepadData(device::GvrGamepadData) override;
   void RegisterGamepadDataFetcher(device::GvrGamepadDataFetcher*) override;
 
  private:
   ~VrShell() override;
-  void PostToGlThreadWhenReady(const base::Closure& task);
+  void WaitForGlThread();
+  void PostToGlThread(const tracked_objects::Location& from_here,
+                      const base::Closure& task);
   void SetUiState();
 
   // device::GvrDelegate implementation.
   void SetWebVRSecureOrigin(bool secure_origin) override;
   void SubmitWebVRFrame(int16_t frame_index,
                         const gpu::MailboxHolder& mailbox) override;
   void UpdateWebVRTextureBounds(int16_t frame_index,
                                 const gfx::RectF& left_bounds,
                                 const gfx::RectF& right_bounds,
                                 const gfx::Size& source_size) override;
@@ skipping 27 matching lines @@
 
   VrShellDelegate* delegate_provider_ = nullptr;
   base::android::ScopedJavaGlobalRef<jobject> j_vr_shell_;
 
   std::unique_ptr<VrInputManager> input_manager_;
   std::unique_ptr<AndroidUiGestureTarget> android_ui_gesture_target_;
   std::unique_ptr<VrMetricsHelper> metrics_helper_;
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
   std::unique_ptr<VrGLThread> gl_thread_;
+  bool thread_started_ = false;
   UiInterface* ui_;
   bool reprojected_rendering_;
 
   jobject content_surface_ = nullptr;
   base::CancelableClosure poll_capturing_media_task_;
   bool is_capturing_audio_ = false;
   bool is_capturing_video_ = false;
   bool is_capturing_screen_ = false;
 
   // TODO(mthiesse): Remove the need for this to be stored here.
   // crbug.com/674594
   gvr_context* gvr_api_;
 
   // Are we currently providing a gamepad factory to the gamepad manager?
   bool gamepad_source_active_ = false;
   // Registered fetcher, must remain alive for UpdateGamepadData calls.
   // That's ok since the fetcher is only destroyed from VrShell's destructor.
   device::GvrGamepadDataFetcher* gamepad_data_fetcher_ = nullptr;
 
   base::WeakPtrFactory<VrShell> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShell);
 };
 
 bool RegisterVrShell(JNIEnv* env);
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_