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

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
index 18a920f324a099a48a4201d92908c7ba8c288cb3..0699e3bf717cb7874a76d82ce0e396bad5b0267b 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
@@ -57,9 +57,10 @@ void GLES2DecoderTestBase::InitDecoder(
 
   InSequence sequence;
 
-  TestHelper::SetupContextGroupInitExpectations(gl_.get(), extensions);
+  TestHelper::SetupContextGroupInitExpectations(gl_.get(),
+      DisallowedExtensions(), extensions);
 
-  EXPECT_TRUE(group_->Initialize(extensions));
+  EXPECT_TRUE(group_->Initialize(DisallowedExtensions(), extensions));
 
   EXPECT_CALL(*gl_, GetIntegerv(GL_ALPHA_BITS, _))
       .WillOnce(SetArgumentPointee<1>(has_alpha_backbuffer ? 8 : 0))
@@ -129,7 +130,8 @@ void GLES2DecoderTestBase::InitDecoder(
 
   decoder_.reset(GLES2Decoder::Create(group_.get()));
   decoder_->Initialize(
-      context_, context_->GetSize(), NULL, std::vector<int32>(), NULL, 0);
+      context_, context_->GetSize(), DisallowedExtensions(),
+      NULL, std::vector<int32>(), NULL, 0);
   decoder_->set_engine(engine_.get());
 
   EXPECT_CALL(*gl_, GenBuffersARB(_, _))