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

gpu/command_buffer/service/gpu_processor.h

Index: gpu/command_buffer/service/gpu_processor.h
diff --git a/gpu/command_buffer/service/gpu_processor.h b/gpu/command_buffer/service/gpu_processor.h
index b76b6e3220dbd6bc7e7b328e8927dcbc239cb56a..a69d315797a34ff0688991bd199aea4e8cdc2da9 100644
--- a/gpu/command_buffer/service/gpu_processor.h
+++ b/gpu/command_buffer/service/gpu_processor.h
@@ -52,6 +52,7 @@ class GPUProcessor : public CommandBufferEngine {
   // Perform platform specific and common initialization.
   bool Initialize(gfx::PluginWindowHandle hwnd,
                   const gfx::Size& size,
+                  const gles2::DisallowedExtensions& extensions,
                   const char* allowed_extensions,
                   const std::vector<int32>& attribs,
                   GPUProcessor* parent,
@@ -118,6 +119,7 @@ class GPUProcessor : public CommandBufferEngine {
   // Perform common initialization. Takes ownership of GLContext.
   bool InitializeCommon(gfx::GLContext* context,
                         const gfx::Size& size,
+                        const gles2::DisallowedExtensions& extensions,
                         const char* allowed_extensions,
                         const std::vector<int32>& attribs,
                         gles2::GLES2Decoder* parent_decoder,