Disable flaky RootWindowTest.TouchMovesHeld on ChromeOS.

ui/aura/root_window_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.
 
 #include "ui/aura/root_window.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/run_loop.h"
@@ skipping 650 matching lines @@
       &mouse_dragged_event);
   dispatcher()->ReleasePointerMoves();
   dispatcher()->AsWindowTreeHostDelegate()->OnHostMouseEvent(
       &mouse_dragged_event2);
   EXPECT_EQ("MOUSE_DRAGGED", EventTypesToString(filter->events()));
   filter->events().clear();
   RunAllPendingInMessageLoop();
   EXPECT_TRUE(filter->events().empty());
 }
 
-TEST_F(RootWindowTest, TouchMovesHeld) {
+#if defined(OS_CHROMEOS)
+// This test may be flaky on Chromium OS valgrind bots: http://crbug.com/333644
+#define MAYBE_TouchMovesHeld DISABLED_TouchMovesHeld
+#else
+#define MAYBE_TouchMovesHeld TouchMovesHeld
+#endif
+TEST_F(RootWindowTest, MAYBE_TouchMovesHeld) {
   EventFilterRecorder* filter = new EventFilterRecorder;
   root_window()->SetEventFilter(filter);  // passes ownership
 
   test::TestWindowDelegate delegate;
   scoped_ptr<aura::Window> window(CreateTestWindowWithDelegate(
       &delegate, 1, gfx::Rect(0, 0, 100, 100), root_window()));
 
   // Starting the touch and throwing out the first few events, since the system
   // is going to generate synthetic mouse events that are not relevant to the
   // test.
@@ skipping 850 matching lines @@
   CHECK(!message_loop()->is_running());
   // Perform the test in a callback, so that it runs after the message-loop
   // starts.
   message_loop()->PostTask(FROM_HERE,
                            base::Bind(&RootWindowTestWithMessageLoop::RunTest,
                                       base::Unretained(this)));
   message_loop()->Run();
 }
 
 }  // namespace aura