Adding the iOS app and integration example with GlRenderer.

remoting/client/gl_desktop.h

Index: remoting/client/gl_desktop.h
diff --git a/remoting/client/gl_desktop.h b/remoting/client/gl_desktop.h
index 2c98cd429d27b26181f0e55371c16a736daf3861..5f303939c1f64b7e56f515029f94e05990b6d43c 100644
--- a/remoting/client/gl_desktop.h
+++ b/remoting/client/gl_desktop.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "remoting/client/gl_drawable.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 
 namespace webrtc {
@@ -21,10 +22,10 @@ class GlCanvas;
 class GlRenderLayer;
 
 // This class draws the desktop on the canvas.
-class GlDesktop {
+class GlDesktop : public GlDrawable {
  public:
   GlDesktop();
-  virtual ~GlDesktop();
+  ~GlDesktop() override;
 
   // |frame| can be either a full frame or updated regions only frame.
   void SetVideoFrame(const webrtc::DesktopFrame& frame);
@@ -32,10 +33,10 @@ class GlDesktop {
   // Sets the canvas on which the desktop will be drawn. Caller must feed a
   // full desktop frame after calling this function.
   // If |canvas| is nullptr, nothing will happen when calling Draw().
-  void SetCanvas(GlCanvas* canvas);
+  void SetCanvas(GlCanvas* canvas) override;
 
   // Draws the desktop on the canvas.
-  void Draw();
+  void Draw() override;
 
  private:
   struct GlDesktopTextureContainer;