Marking LayerTreeHostTestDeviceScaleFactorScalesViewportAndLayers test as flaky

cc/layer_tree_host_unittest.cc

 // Copyright 2011 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.
 
 #include "cc/layer_tree_host.h"
 
 #include "base/synchronization/lock.h"
 #include "cc/content_layer.h"
 #include "cc/content_layer_client.h"
 #include "cc/layer_impl.h"
@@ skipping 1358 matching lines @@
         m_rootLayer = NULL;
         m_childLayer = NULL;
     }
 
 private:
     FakeContentLayerClient m_client;
     scoped_refptr<NoScaleContentLayer> m_rootLayer;
     scoped_refptr<ContentLayer> m_childLayer;
 };
 
-TEST_F(LayerTreeHostTestDeviceScaleFactorScalesViewportAndLayers, runMultiThread)
+// http://crbug.com/164851.
+TEST_F(LayerTreeHostTestDeviceScaleFactorScalesViewportAndLayers, FLAKY_runMultiThread)
 {
     runTest(true);
 }
 
 // Verify atomicity of commits and reuse of textures.
 class LayerTreeHostTestAtomicCommit : public LayerTreeHostTest {
 public:
     LayerTreeHostTestAtomicCommit()
         : m_layer(ContentLayerWithUpdateTracking::create(&m_client))
     {
@@ skipping 1962 matching lines @@
     LayerTreeSettings settings;
     settings.maxPartialTextureUpdates = 4;
 
     scoped_ptr<LayerTreeHost> host = LayerTreeHost::create(&client, settings, scoped_ptr<Thread>());
     EXPECT_TRUE(host->initializeRendererIfNeeded());
     EXPECT_EQ(4u, host->settings().maxPartialTextureUpdates);
 }
 
 }  // namespace
 }  // namespace cc