[Remoting Android] Fix thread issue with OpenGL drawable

remoting/client/display/gl_renderer.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 REMOTING_CLIENT_DISPLAY_GL_RENDERER_H_
 #define REMOTING_CLIENT_DISPLAY_GL_RENDERER_H_
 
 #include <queue>
 #include <vector>
 
@@ skipping 80 matching lines @@
 
   // Called when the surface is destroyed.
   void OnSurfaceDestroyed();
 
   void AddDrawable(base::WeakPtr<Drawable> drawable);
 
   // Returns the weak pointer to be used on the display thread.
   base::WeakPtr<GlRenderer> GetWeakPtr();
 
   // Convenience method to create a Renderer with standard desktop components.
+  // This function must be called on the display thread, or whatever thread that
+  // will be used after the renderer is created.
   static std::unique_ptr<GlRenderer> CreateGlRendererWithDesktop();
 
  private:
   friend class GlRendererTest;
 
   // Post a rendering task to the task runner of current thread.
   // Do nothing if render_callback_ is not set yet or an existing rendering task
   // in the queue will cover changes before this function is called.
   void RequestRender();
 
@@ skipping 25 matching lines @@
   base::ThreadChecker thread_checker_;
   base::WeakPtr<GlRenderer> weak_ptr_;
   base::WeakPtrFactory<GlRenderer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GlRenderer);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_DISPLAY_GL_RENDERER_H_