Make ShareGroup thread safe

gpu/command_buffer/client/share_group_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Tests for the ShareGroup.
 
 #include "gpu/command_buffer/client/share_group.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace gpu {
 namespace gles2 {
 
 class ShareGroupTest : public testing::Test {
  protected:
 
   virtual void SetUp() {
-    share_group_ = ShareGroup::Ref(new ShareGroup());
+    share_group_ = ShareGroup::Ref(new ShareGroup(false, false));
   }
 
   virtual void TearDown() {
   }
 
   scoped_refptr<ShareGroup> share_group_;
 };
 
 TEST_F(ShareGroupTest, Basic) {
   EXPECT_TRUE(ShareGroup::ImplementsThreadSafeReferenceCounting());
 }
 
 }  // namespace gles2
 }  // namespace gpu