Connect up --disable-gl-multisampling to command buffer

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 ad85737cea5468da3f0e3b6b364ea6a53b859be8..7a38bf35fb06cb3e88aeef97ab955043409a195f 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -79,6 +79,14 @@ class ExtensionHelper {
 };
 
 bool FeatureInfo::Initialize(const char* allowed_features) {
+  disallowed_extensions_ = DisallowedExtensions();
+  AddFeatures(allowed_features);
+  return true;
+}
+
+bool FeatureInfo::Initialize(const DisallowedExtensions& disallowed_extensions,
+                             const char* allowed_features) {
+  disallowed_extensions_ = disallowed_extensions;
   AddFeatures(allowed_features);
   return true;
 }
@@ -275,7 +283,8 @@ void FeatureInfo::AddFeatures(const char* desired_features) {
   }
 
   // Check for multisample support
-  if (ext.Desire("GL_CHROMIUM_framebuffer_multisample") &&
+  if (!disallowed_extensions_.multisampling &&
+      ext.Desire("GL_CHROMIUM_framebuffer_multisample") &&
       (ext.Have("GL_EXT_framebuffer_multisample") ||
        ext.Have("GL_ANGLE_framebuffer_multisample"))) {
     feature_flags_.chromium_framebuffer_multisample = true;