Implement EXT_draw_buffers WebGL extention support in command buffer.

gpu/command_buffer/service/context_group.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_COMMAND_BUFFER_SERVICE_CONTEXT_GROUP_H_
 #define GPU_COMMAND_BUFFER_SERVICE_CONTEXT_GROUP_H_
 
 #include <string>
 #include <vector>
 #include "base/basictypes.h"
@@ skipping 85 matching lines @@
   }
 
   uint32 max_varying_vectors() const {
     return max_varying_vectors_;
   }
 
   uint32 max_vertex_uniform_vectors() const {
     return max_vertex_uniform_vectors_;
   }
 
+  uint32 max_color_attachments() const {
+    return max_color_attachments_;
+  }
+
+  uint32 max_draw_buffers() const {
+    return max_draw_buffers_;
+  }
+
   FeatureInfo* feature_info() {
     return feature_info_.get();
   }
 
   BufferManager* buffer_manager() const {
     return buffer_manager_.get();
   }
 
   FramebufferManager* framebuffer_manager() const {
     return framebuffer_manager_.get();
@@ skipping 52 matching lines @@
   bool enforce_gl_minimums_;
   bool bind_generates_resource_;
 
   uint32 max_vertex_attribs_;
   uint32 max_texture_units_;
   uint32 max_texture_image_units_;
   uint32 max_vertex_texture_image_units_;
   uint32 max_fragment_uniform_vectors_;
   uint32 max_varying_vectors_;
   uint32 max_vertex_uniform_vectors_;
+  uint32 max_color_attachments_;
+  uint32 max_draw_buffers_;
 
   ProgramCache* program_cache_;
 
   scoped_ptr<BufferManager> buffer_manager_;
 
   scoped_ptr<FramebufferManager> framebuffer_manager_;
 
   scoped_ptr<RenderbufferManager> renderbuffer_manager_;
 
   scoped_ptr<TextureManager> texture_manager_;
@@ skipping 11 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ContextGroup);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_CONTEXT_GROUP_H_