NOT FOR COMMIT - make crbug.com/630625 reproducible

components/exo/gamepad_unittest.cc

 // Copyright 2015 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 "ash/shell.h"
 #include "base/command_line.h"
 #include "base/test/test_simple_task_runner.h"
 #include "components/exo/buffer.h"
 #include "components/exo/gamepad.h"
 #include "components/exo/gamepad_delegate.h"
@@ skipping 127 matching lines @@
   axis_moved.items[0].timestamp = 1;
   axis_moved.items[0].axesLength = 1;
   axis_moved.items[0].axes[0] = 1.0;
 
   EXPECT_CALL(delegate, OnStateChange(true)).Times(1);
   EXPECT_CALL(delegate, OnAxis(0, 1.0)).Times(1);
   EXPECT_CALL(delegate, OnFrame()).Times(1);
   SetDataAndPostToDelegate(axis_moved);
 
   DestroyGamepad(&delegate);
+  usleep(100000);
+  base::MessageLoop::current()->RunUntilIdle();
+  usleep(100000);
+  base::MessageLoop::current()->RunUntilIdle();
+  usleep(100000);
+  base::MessageLoop::current()->RunUntilIdle();
 }
 
 TEST_F(GamepadTest, OnButton) {
   std::unique_ptr<Surface> surface(new Surface);
   std::unique_ptr<ShellSurface> shell_surface(new ShellSurface(surface.get()));
   gfx::Size buffer_size(10, 10);
   std::unique_ptr<Buffer> buffer(
       new Buffer(exo_test_helper()->CreateGpuMemoryBuffer(buffer_size)));
   surface->Attach(buffer.get());
   surface->Commit();
@@ skipping 54 matching lines @@
   // scheduled in the next round.
   polling_task_runner_->RunPendingTasks();
   polling_task_runner_->RunPendingTasks();
   ASSERT_FALSE(polling_task_runner_->HasPendingTask());
 
   DestroyGamepad(&delegate);
 }
 
 }  // namespace
 }  // namespace exo