[Chromoting] Implement GlRenderer

remoting/client/gl_renderer_delegate.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_GL_RENDERER_DELEGATE_H_
+#define REMOTING_CLIENT_GL_RENDERER_DELEGATE_H_
+
+#include "base/macros.h"
+
+namespace remoting {
+
+// Interface to interact with GlRenderer. All functions will be called on the
+// display thread.
+class GlRendererDelegate {
+ public:
+  // Called when GlRenderer is about to render a frame on current OpenGL
+  // surface. Return true if GlRenderer can continue the render process.
+  virtual bool CanRenderFrame() = 0;
+
+  // Called after GlRenderer has successfully rendered a frame on current OpenGL
+  // surface.
+  virtual void OnFrameRendered() = 0;
+
+  // Called when the size of the canvas (= size of desktop frame) is changed.
+  virtual void OnSizeChanged(int width, int height) = 0;
+
+ protected:
+  virtual ~GlRendererDelegate() {}
+};
+
+}  // namespace remoting
+#endif  // REMOTING_CLIENT_GL_RENDERER_DELEGATE_H_