Initial implementation of API WakeLock.

Source/modules/wake_lock/NavigatorWakeLock.cpp

+// 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 "config.h"
+#include "modules/wake_lock/NavigatorWakeLock.h"
+
+#include "core/dom/Document.h"
+#include "core/frame/LocalFrame.h"
+#include "core/frame/Navigator.h"
+#include "modules/wake_lock/WakeLock.h"
+
+namespace blink {
+
+NavigatorWakeLock::NavigatorWakeLock(LocalFrame* frame)
+    : DOMWindowProperty(frame)

[mlamouri (slow - plz ping), 2014/08/18 12:15:52]

I would keep this ctor as a default ctor (ie. no LocalFrame*).

[redchenko, 2014/08/19 16:42:19]

Done.

+{
+}
+
+NavigatorWakeLock::~NavigatorWakeLock()
+{
+}
+
+const char* NavigatorWakeLock::supplementName()
+{
+    return "NavigatorWakeLock";
+}
+
+NavigatorWakeLock& NavigatorWakeLock::from(Navigator& navigator)
+{
+    NavigatorWakeLock* supplement = static_cast<NavigatorWakeLock*>(WillBeHeapSupplement<Navigator>::from(navigator, supplementName()));
+    if (!supplement) {
+        supplement = new NavigatorWakeLock(navigator.frame());
+        provideTo(navigator, supplementName(), adoptPtrWillBeNoop(supplement));
+    }
+    return *supplement;
+}
+
+WakeLock* NavigatorWakeLock::wakeLock(Navigator& navigator)
+{
+    return NavigatorWakeLock::from(navigator).wakeLock();
+}
+
+WakeLock* NavigatorWakeLock::wakeLock() const
+{
+    if (!m_wakeLock && frame())
+        m_wakeLock = WakeLock::create(frame()->document());

[mlamouri (slow - plz ping), 2014/08/18 12:15:52]

It seems that what you really want here is not a frame() or a document() but the
ExecutionContext. You can get that from the ScriptState. If you add
[CallWith=ScriptState] in the idl file, you should get the bindings to generate
static NavigatorWakeLock::wakeLock(ScriptState*, Navigator&), then you can have
NavigatorWakeLock::wakeLock(ScriptState*).

Doing that would prevent NavigatorWakeLock from inheriting from
DOMWindowProperty so you will not need to keep track of the window and frame
here while you actually don't need to.

[redchenko, 2014/08/19 16:42:19]

Done.

+    return m_wakeLock.get();
+}
+
+void NavigatorWakeLock::trace(Visitor* visitor)
+{
+    ASSERT(visitor);

[mlamouri (slow - plz ping), 2014/08/18 12:15:52]

I don't think you need that.

[redchenko, 2014/08/19 16:42:19]

Done.

+    visitor->trace(m_wakeLock);
+    WillBeHeapSupplement<Navigator>::trace(visitor);
+}
+
+} // namespace WebCore