Add initial support for NV_path_rendering extension to gpu command buffer

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/macros.h"
@@ skipping 116 matching lines @@
       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_swiftshader(false),
       angle_texture_usage(false),
-      ext_texture_storage(false) {
+      ext_texture_storage(false),
+      chromium_path_rendering(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) {
 }
 
@@ skipping 621 matching lines @@
     // TODO(dsinclair): Add AddExtensionString("GL_CHROMIUM_sampler_objects")
     // when available.
   }
 
   if ((is_es3 || extensions.Contains("GL_EXT_discard_framebuffer")) &&
       !workarounds_.disable_ext_discard_framebuffer) {
     // DiscardFramebufferEXT is automatically bound to InvalidateFramebuffer.
     AddExtensionString("GL_EXT_discard_framebuffer");
     feature_flags_.ext_discard_framebuffer = true;
   }
+
+  if (extensions.Contains("GL_NV_path_rendering") &&
+      extensions.Contains("GL_EXT_direct_state_access")) {
+    AddExtensionString("GL_CHROMIUM_path_rendering");
+    feature_flags_.chromium_path_rendering = true;
+    validators_.g_l_state.AddValue(GL_MODELVIEW_MATRIX_CHROMIUM);
+    validators_.g_l_state.AddValue(GL_PROJECTION_MATRIX_CHROMIUM);
+  }
 }
 
 void FeatureInfo::AddExtensionString(const std::string& str) {
   size_t pos = extensions_.find(str);
   while (pos != std::string::npos &&
          pos + str.length() < extensions_.length() &&
          extensions_.substr(pos + str.length(), 1) != " ") {
     // This extension name is a substring of another.
     pos = extensions_.find(str, pos + str.length());
   }
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu