command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index e853d9b59387fac65e910d0ca3fb0cdba2fcf157..5147fd5f7eb7d189531cf632ebfd7a1aab94d57f 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -856,6 +856,9 @@ void FeatureInfo::InitializeFeatures() {
       feature_flags_.chromium_path_rendering = true;
       validators_.g_l_state.AddValue(GL_PATH_MODELVIEW_MATRIX_CHROMIUM);
       validators_.g_l_state.AddValue(GL_PATH_PROJECTION_MATRIX_CHROMIUM);
+      validators_.g_l_state.AddValue(GL_PATH_STENCIL_FUNC_CHROMIUM);
+      validators_.g_l_state.AddValue(GL_PATH_STENCIL_REF_CHROMIUM);
+      validators_.g_l_state.AddValue(GL_PATH_STENCIL_VALUE_MASK_CHROMIUM);
     }
   }
 }