Fix CompositorResizeLock to do something.

ui/compositor/test/fake_compositor_lock.h

Index: ui/compositor/test/fake_compositor_lock.h
diff --git a/ui/compositor/test/fake_compositor_lock.h b/ui/compositor/test/fake_compositor_lock.h
new file mode 100644
index 0000000000000000000000000000000000000000..0a081b379be24a20e6907e88847c66e379e87287
--- /dev/null
+++ b/ui/compositor/test/fake_compositor_lock.h
@@ -0,0 +1,28 @@
+// Copyright 2017 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.
+
+#ifndef UI_COMPOSITOR_FAKE_COMPOSITOR_LOCK_H_
+#define UI_COMPOSITOR_FAKE_COMPOSITOR_LOCK_H_
+
+#include "ui/compositor/compositor_lock.h"
+
+namespace ui {
+
+class FakeCompositorLock : public CompositorLock {
+ public:
+  explicit FakeCompositorLock(CompositorLockClient* client,
+                              CompositorLockDelegate* delegate,
+                              base::SequencedTaskRunner* task_runner,
+                              base::TimeDelta timeout);
+
+  // Allow tests to cause the lock to timeout.
+  using CompositorLock::TimeoutLock;
+
+ private:
+  ~FakeCompositorLock() {}
+};
+
+}  // namespace
+
+#endif  // UI_COMPOSITOR_FAKE_COMPOSITOR_LOCK_H_