Implemented failIfMajorPerformanceCaveat WebGL context creation attribute.

gpu/command_buffer/service/feature_info.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/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 109 matching lines @@
       use_arb_occlusion_query_for_occlusion_query_boolean(false),
       native_vertex_array_object(false),
       enable_shader_name_hashing(false),
       enable_samplers(false),
       ext_draw_buffers(false),
       ext_frag_depth(false),
       use_async_readpixels(false),
       map_buffer_range(false),
       ext_discard_framebuffer(false),
       angle_depth_texture(false),
-      is_angle(false) {
+      is_angle(false),
+      is_swiftshader(false) {
 }
 
 FeatureInfo::Workarounds::Workarounds() :
 #define GPU_OP(type, name) name(false),
     GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
 #undef GPU_OP
     max_texture_size(0),
     max_cube_map_texture_size(0) {
 }
 
 FeatureInfo::FeatureInfo() {
   InitializeBasicState(*CommandLine::ForCurrentProcess());
 }
 
 FeatureInfo::FeatureInfo(const CommandLine& command_line) {
   InitializeBasicState(command_line);
 }
 
 void FeatureInfo::InitializeBasicState(const CommandLine& command_line) {
   if (command_line.HasSwitch(switches::kGpuDriverBugWorkarounds)) {
     std::string types = command_line.GetSwitchValueASCII(
         switches::kGpuDriverBugWorkarounds);
     StringToWorkarounds(types, &workarounds_);
   }
   feature_flags_.enable_shader_name_hashing =
       !command_line.HasSwitch(switches::kDisableShaderNameHashing);
 
+  feature_flags_.is_swiftshader =
+      (command_line.GetSwitchValueASCII(switches::kUseGL) == "swiftshader");
+
   static const GLenum kAlphaTypes[] = {
       GL_UNSIGNED_BYTE,
   };
   static const GLenum kRGBTypes[] = {
       GL_UNSIGNED_BYTE,
       GL_UNSIGNED_SHORT_5_6_5,
   };
   static const GLenum kRGBATypes[] = {
       GL_UNSIGNED_BYTE,
       GL_UNSIGNED_SHORT_4_4_4_4,
@@ skipping 555 matching lines @@
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu