Fix CompositorResizeLock to do something.

content/browser/renderer_host/compositor_resize_lock.cc

+// Copyright 2014 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 "content/browser/renderer_host/compositor_resize_lock.h"
+
+#include "base/trace_event/trace_event.h"
+#include "content/public/browser/browser_thread.h"
+#include "ui/compositor/compositor.h"
+
+namespace content {
+
+CompositorResizeLock::CompositorResizeLock(CompositorResizeLockClient* client,
+                                           const gfx::Size& new_size)
+    : client_(client), expected_size_(new_size) {
+  TRACE_EVENT_ASYNC_BEGIN2("ui", "CompositorResizeLock", this, "width",
+                           expected_size().width(), "height",
+                           expected_size().height());
+}
+
+CompositorResizeLock::~CompositorResizeLock() {
+  compositor_lock_ = nullptr;
+  if (client_)
+    client_->CompositorResizeLockEnded();
+
+  TRACE_EVENT_ASYNC_END2("ui", "CompositorResizeLock", this, "width",
+                         expected_size().width(), "height",
+                         expected_size().height());
+}
+
+bool CompositorResizeLock::Lock() {
+  if (unlocked_ || compositor_lock_)
+    return false;
+  compositor_lock_ = client_->GetCompositorLock(this);
+  return true;
+}
+
+void CompositorResizeLock::UnlockCompositor() {
+  unlocked_ = true;
+  compositor_lock_ = nullptr;
+}
+
+void CompositorResizeLock::CompositorLockTimedOut() {
+  UnlockCompositor();
+  if (client_) {
+    client_->CompositorResizeLockEnded();
+    client_ = nullptr;
+  }
+}
+
+}  // namespace content