Add GL_TEXTURE_EXTERNAL_OES as supported texture target for CHROMIUM_map_image.

ui/gl/gl_image_shm.h

 // Copyright 2013 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 UI_GL_GL_IMAGE_SHM_H_
 #define UI_GL_GL_IMAGE_SHM_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_image.h"
 
 namespace gfx {
 
 class GL_EXPORT GLImageShm : public GLImage {
  public:
   GLImageShm(gfx::Size size, unsigned internalformat);
 
   bool Initialize(gfx::GpuMemoryBufferHandle buffer);
+  void CreateTexture2D();
+  bool CreateEGLImage();
+  void ReleaseEGLImageandTexture();
 
   // Overridden from GLImage:
   virtual void Destroy() OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual bool BindTexImage(unsigned target) OVERRIDE;
   virtual void ReleaseTexImage(unsigned target) OVERRIDE;
   virtual void WillUseTexImage() OVERRIDE;
   virtual void DidUseTexImage() OVERRIDE;
 
  protected:
   virtual ~GLImageShm();
 
  private:
   scoped_ptr<base::SharedMemory> shared_memory_;
   gfx::Size size_;
   unsigned internalformat_;
+  GLuint external_texture_id_;
+  EGLImageKHR egl_image_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageShm);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_SHM_H_