gpu: Add CopyTexImage function to GLImage API.

ui/gl/gl_image_memory.h

 // Copyright 2014 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_MEMORY_H_
 #define UI_GL_GL_IMAGE_MEMORY_H_
 
 #include "ui/gl/gl_image.h"
 
 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
     defined(USE_OZONE)
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 #endif
 
 namespace gfx {
 
 class GL_EXPORT GLImageMemory : public GLImage {
  public:
   GLImageMemory(const gfx::Size& size, unsigned internalformat);
 
   bool Initialize(const unsigned char* memory);
 
   // Overridden from GLImage:
   virtual void Destroy(bool have_context) 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 {}
+  virtual bool CopyTexImage(unsigned target) OVERRIDE;
+  virtual void WillUseTexImage() OVERRIDE;
+  virtual void DidUseTexImage() OVERRIDE;
   virtual void WillModifyTexImage() OVERRIDE {}
   virtual void DidModifyTexImage() OVERRIDE {}
   virtual bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                     int z_order,
                                     OverlayTransform transform,
                                     const Rect& bounds_rect,
                                     const RectF& crop_rect) OVERRIDE;
 
  protected:
   virtual ~GLImageMemory();
 
   bool HasValidFormat() const;
   size_t Bytes() const;
 
  private:
+  void DoBindTexImage(unsigned target);
+
   const unsigned char* memory_;
   const gfx::Size size_;
   const unsigned internalformat_;
+  bool in_use_;
+  unsigned target_;
+  bool need_do_bind_tex_image_;
 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
     defined(USE_OZONE)
   unsigned egl_texture_id_;
   EGLImageKHR egl_image_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(GLImageMemory);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_MEMORY_H_