Fix CompositorResizeLock to do something.

ui/compositor/compositor_lock.cc

Index: ui/compositor/compositor_lock.cc
diff --git a/ui/compositor/compositor_lock.cc b/ui/compositor/compositor_lock.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8b001debe0083b618ade99dfc997977301a07748
--- /dev/null
+++ b/ui/compositor/compositor_lock.cc
@@ -0,0 +1,25 @@
+// 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.
+
+#include "ui/compositor/compositor_lock.h"
+
+namespace ui {
+
+CompositorLock::CompositorLock(CompositorLockClient* client,
+                               base::WeakPtr<CompositorLockDelegate> delegate)
+    : client_(client), delegate_(std::move(delegate)) {}
+
+CompositorLock::~CompositorLock() {
+  if (delegate_)
+    delegate_->RemoveCompositorLock(this);
+}
+
+void CompositorLock::TimeoutLock() {
+  delegate_->RemoveCompositorLock(this);
+  delegate_ = nullptr;
+  if (client_)
+    client_->CompositorLockTimedOut();
+}
+
+}  // namespace ui