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

gpu/command_buffer/service/gpu_processor_mac.cc

Index: gpu/command_buffer/service/gpu_processor_mac.cc
diff --git a/gpu/command_buffer/service/gpu_processor_mac.cc b/gpu/command_buffer/service/gpu_processor_mac.cc
index 4d9ba185d2b1cb58918ca56cbc12b7476ef42837..440210eecafb553ae735dd2eb2b96fe9eaaae437 100644
--- a/gpu/command_buffer/service/gpu_processor_mac.cc
+++ b/gpu/command_buffer/service/gpu_processor_mac.cc
@@ -11,6 +11,7 @@ namespace gpu {
 
 bool GPUProcessor::Initialize(gfx::PluginWindowHandle window,
                               const gfx::Size& size,
+                              const gles2::DisallowedExtensions& disallowed,
                               const char* allowed_extensions,
                               const std::vector<int32>& attribs,
                               GPUProcessor* parent,
@@ -53,6 +54,7 @@ bool GPUProcessor::Initialize(gfx::PluginWindowHandle window,
 
   return InitializeCommon(context.release(),
                           size,
+                          disallowed
                           allowed_extensions,
                           attribs,
                           parent_decoder,