Add GL_EXT_color_buffer_half_float support

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // 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.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 3727 matching lines @@
   caps.flips_vertically = !is_offscreen && surface_->FlipsVertically();
   caps.msaa_is_slow = workarounds().msaa_is_slow;
 
   caps.blend_equation_advanced =
       feature_info_->feature_flags().blend_equation_advanced;
   caps.blend_equation_advanced_coherent =
       feature_info_->feature_flags().blend_equation_advanced_coherent;
   caps.texture_rg = feature_info_->feature_flags().ext_texture_rg;
   caps.texture_half_float_linear =
       feature_info_->feature_flags().enable_texture_half_float_linear;
-  caps.color_buffer_float =
-      feature_info_->feature_flags().enable_color_buffer_float;
+  caps.color_buffer_half_float_rgba =
+      feature_info_->feature_flags().enable_color_buffer_float ||
+      feature_info_->feature_flags().enable_color_buffer_half_float;
   caps.image_ycbcr_422 =
       feature_info_->feature_flags().chromium_image_ycbcr_422;
   caps.image_ycbcr_420v =
       feature_info_->feature_flags().chromium_image_ycbcr_420v;
   caps.max_copy_texture_chromium_size =
       workarounds().max_copy_texture_chromium_size;
   caps.render_buffer_format_bgra8888 =
       feature_info_->feature_flags().ext_render_buffer_format_bgra8888;
   caps.occlusion_query = feature_info_->feature_flags().occlusion_query;
   caps.occlusion_query_boolean =
@@ skipping 15530 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu