gpu: Extend CopyTextureCHROMIUM with support for copying part of source texture.

gpu/blink/webgraphicscontext3d_impl.h

 // Copyright (c) 2012 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 GPU_BLINK_WEBGRAPHICSCONTEXT3D_IMPL_H_
 #define GPU_BLINK_WEBGRAPHICSCONTEXT3D_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 510 matching lines @@
   void copyTextureCHROMIUM(blink::WGC3Denum target,
                            blink::WebGLId source_id,
                            blink::WebGLId dest_id,
                            blink::WGC3Denum internal_format,
                            blink::WGC3Denum dest_type) override;
 
   void copySubTextureCHROMIUM(blink::WGC3Denum target,
                               blink::WebGLId source_id,
                               blink::WebGLId dest_id,
                               blink::WGC3Dint xoffset,
-                              blink::WGC3Dint yoffset) override;
+                              blink::WGC3Dint yoffset,
+                              blink::WGC3Dint x,
+                              blink::WGC3Dint y,
+                              blink::WGC3Dsizei width,
+                              blink::WGC3Dsizei height) override;
 
   virtual void bindUniformLocationCHROMIUM(blink::WebGLId program,
                                            blink::WGC3Dint location,
                                            const blink::WGC3Dchar* uniform);
 
   virtual void shallowFlushCHROMIUM();
   virtual void shallowFinishCHROMIUM();
 
   virtual void genMailboxCHROMIUM(blink::WGC3Dbyte* mailbox);
   virtual void produceTextureCHROMIUM(blink::WGC3Denum target,
@@ skipping 415 matching lines @@
   std::vector<blink::WGC3Denum> synthetic_errors_;
 
   ::gpu::gles2::GLES2Interface* gl_;
   bool lose_context_when_out_of_memory_;
   uint32_t flush_id_;
 };
 
 }  // namespace gpu_blink
 
 #endif  // GPU_BLINK_WEBGRAPHICSCONTEXT3D_IMPL_H_