Add GL_EXT_color_buffer_half_float support

gpu/command_buffer/service/gles2_cmd_decoder.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.
 
 // This file contains the GLES2Decoder class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 
 #include <stdint.h>
@@ skipping 36 matching lines @@
 class Logger;
 class QueryManager;
 class ShaderTranslatorInterface;
 class Texture;
 class TransformFeedbackManager;
 class VertexArrayManager;
 struct ContextCreationAttribHelper;
 struct ContextState;
 
 struct DisallowedFeatures {
-  DisallowedFeatures()
-      : gpu_memory_manager(false),
-        npot_support(false),
-        chromium_color_buffer_float_rgba(false),
-        chromium_color_buffer_float_rgb(false),
-        ext_color_buffer_float(false),
-        oes_texture_float_linear(false),
-        oes_texture_half_float_linear(false) {
-  }
+  DisallowedFeatures() {}
 
   void AllowExtensions() {
     chromium_color_buffer_float_rgba = false;
     chromium_color_buffer_float_rgb = false;
     ext_color_buffer_float = false;
+    ext_color_buffer_half_float = false;
     oes_texture_float_linear = false;
     oes_texture_half_float_linear = false;
   }
 
-  bool gpu_memory_manager;
-  bool npot_support;
-  bool chromium_color_buffer_float_rgba;
-  bool chromium_color_buffer_float_rgb;
-  bool ext_color_buffer_float;
-  bool oes_texture_float_linear;
-  bool oes_texture_half_float_linear;
+  bool gpu_memory_manager = false;
+  bool npot_support = false;
+  bool chromium_color_buffer_float_rgba = false;
+  bool chromium_color_buffer_float_rgb = false;
+  bool ext_color_buffer_float = false;
+  bool ext_color_buffer_half_float = false;
+  bool oes_texture_float_linear = false;
+  bool oes_texture_half_float_linear = false;
 };
 
 typedef base::Callback<void(const std::string& key,
                             const std::string& shader)> ShaderCacheCallback;
 
 // This class implements the AsyncAPIInterface interface, decoding GLES2
 // commands and calling GL.
 class GPU_EXPORT GLES2Decoder : public base::SupportsWeakPtr<GLES2Decoder>,
                                 public CommonDecoder {
  public:
@@ skipping 248 matching lines @@
   bool initialized_;
   bool debug_;
   bool log_commands_;
   DISALLOW_COPY_AND_ASSIGN(GLES2Decoder);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_