Add swapBuffer call to SkGLContextHelper.

include/gpu/gl/SkNativeGLContext.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkNativeGLContext_DEFINED
 #define SkNativeGLContext_DEFINED
 
@@ skipping 12 matching lines @@
     #include <GL/GL.h>
 #endif
 
 class SkNativeGLContext : public SkGLContextHelper {
 public:
     SkNativeGLContext();
 
     virtual ~SkNativeGLContext();
 
     virtual void makeCurrent() const SK_OVERRIDE;
+    virtual void swapBuffers() const SK_OVERRIDE;
 
     class AutoContextRestore {
     public:
         AutoContextRestore();
         ~AutoContextRestore();
 
     private:
     #if defined(SK_BUILD_FOR_MAC)
         CGLContextObj fOldCGLContext;
     #elif defined(SK_BUILD_FOR_ANDROID) || defined(SK_BUILD_FOR_NACL)
@@ skipping 33 matching lines @@
     HWND fWindow;
     HDC fDeviceContext;
     HGLRC fGlRenderContext;
     static ATOM gWC;
 #elif defined(SK_BUILD_FOR_IOS)
     void* fEAGLContext;
 #endif
 };
 
 #endif