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..68a47edf49b772ca2d7c77b236e1700c7a815f5e 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -78,7 +78,9 @@ class ExtensionHelper {
   std::set<std::string> desired_extensions_;
 };
 
-bool FeatureInfo::Initialize(const char* allowed_features) {
+bool FeatureInfo::Initialize(const DisallowedExtensions& extensions,
+                             const char* allowed_features) {
+  disallowed_extensions_ = extensions;
   AddFeatures(allowed_features);
   return true;
 }
@@ -275,7 +277,8 @@ 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;