Implement EXT_draw_buffers WebGL extention support in command buffer.

webkit/gpu/webgraphicscontext3d_in_process_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 WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_
 #define WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_
 
 #include <list>
 #include <set>
 
@@ skipping 481 matching lines @@
                                       const WGC3Dbyte* mailbox);
   virtual void consumeTextureCHROMIUM(WGC3Denum target,
                                       const WGC3Dbyte* mailbox);
 
   virtual void bindTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint imageId);
   virtual void releaseTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint imageId);
 
   virtual void* mapBufferCHROMIUM(WGC3Denum target, WGC3Denum access);
   virtual WGC3Dboolean unmapBufferCHROMIUM(WGC3Denum target);
 
+  virtual void drawBuffersEXT(WGC3Dsizei n, const WGC3Denum* bufs);
+
  protected:
   virtual GrGLInterface* onCreateGrGLInterface();
 
  private:
   bool Initialize(Attributes attributes);
 
   // ANGLE related.
   struct ShaderSourceEntry;
 
   typedef base::hash_map<WebGLId, ShaderSourceEntry*> ShaderSourceMap;
@@ skipping 60 matching lines @@
   ShaderSourceMap shader_source_map_;
 
   ShHandle fragment_compiler_;
   ShHandle vertex_compiler_;
 };
 
 }  // namespace gpu
 }  // namespace webkit
 
 #endif  // WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_