Reland of Revert of gpu: introduce glCopySubTextureCHROMIUM (patchset #1 id:1 of https://codereview…

gpu/command_buffer/service/texture_definition.cc

 // 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.
 
 #include "gpu/command_buffer/service/texture_definition.h"
 
 #include <list>
 
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 15 matching lines @@
 class GLImageSync : public gfx::GLImage {
  public:
   explicit GLImageSync(const scoped_refptr<NativeImageBuffer>& buffer,
                        const gfx::Size& size);
 
   // Implement GLImage.
   void Destroy(bool have_context) override;
   gfx::Size GetSize() override;
   bool BindTexImage(unsigned target) override;
   void ReleaseTexImage(unsigned target) override;
-  bool CopyTexImage(unsigned target) override;
+  bool CopyTexSubImage(unsigned target, int xoffset, int yoffset) override;
   void WillUseTexImage() override;
   void WillModifyTexImage() override;
   void DidModifyTexImage() override;
   void DidUseTexImage() override;
   bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                             int z_order,
                             gfx::OverlayTransform transform,
                             const gfx::Rect& bounds_rect,
                             const gfx::RectF& crop_rect) override;
 
@@ skipping 28 matching lines @@
 
 bool GLImageSync::BindTexImage(unsigned target) {
   NOTREACHED();
   return false;
 }
 
 void GLImageSync::ReleaseTexImage(unsigned target) {
   NOTREACHED();
 }
 
-bool GLImageSync::CopyTexImage(unsigned target) {
+bool GLImageSync::CopyTexSubImage(unsigned target, int xoffset, int yoffset) {
   return false;
 }
 
 void GLImageSync::WillUseTexImage() {
 }
 
 void GLImageSync::DidUseTexImage() {
 }
 
 void GLImageSync::WillModifyTexImage() {
@@ skipping 321 matching lines @@
 
   return true;
 }
 
 bool TextureDefinition::SafeToRenderFrom() const {
   return level_info_.cleared;
 }
 
 }  // namespace gles2
 }  // namespace gpu