Wake Lock API implementation (Blink part)

Source/modules/wake_lock/WakeLockController.cpp

Index: Source/modules/wake_lock/WakeLockController.cpp
diff --git a/Source/modules/wake_lock/WakeLockController.cpp b/Source/modules/wake_lock/WakeLockController.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..2203e08d61ee414aacd7a6f8f27cdc73f29419ae
--- /dev/null
+++ b/Source/modules/wake_lock/WakeLockController.cpp
@@ -0,0 +1,48 @@
+// 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 "config.h"
+#include "modules/wake_lock/WakeLockController.h"
+
+#include "public/platform/modules/wake_lock/WebWakeLockClient.h"
+
+namespace blink {
+
+WakeLockController::WakeLockController(LocalFrame& frame, WebWakeLockClient* client)
+    : m_client(client)
+{
+}
+
+// static
+PassOwnPtrWillBeRawPtr<WakeLockController> WakeLockController::create(LocalFrame& frame, WebWakeLockClient* client)

[mlamouri (slow - plz ping), 2015/05/05 13:45:44]

You only use this method in ::provideTo(). It seems like you could simply move
that line there.

+{
+    return adoptPtrWillBeNoop(new WakeLockController(frame, client));
+}
+
+// static
+const char* WakeLockController::supplementName()
+{
+    return "WakeLockController";
+}
+
+// static
+WakeLockController* WakeLockController::from(LocalFrame* frame)
+{
+    return static_cast<WakeLockController*>(WillBeHeapSupplement<LocalFrame>::from(frame, supplementName()));
+}
+
+// static
+void WakeLockController::provideTo(LocalFrame& frame, WebWakeLockClient* client)
+{
+    WillBeHeapSupplement<LocalFrame>::provideTo(frame, WakeLockController::supplementName(), WakeLockController::create(frame, client));

[mlamouri (slow - plz ping), 2015/05/05 13:45:44]

Could you add an ASSERT() checking that
RuntimeEnabledFeatures::wakeLockEnabled() is true?

+}
+
+void WakeLockController::requestKeepScreenAwake(bool keepScreenAwake)
+{
+    if (m_client) {
+        m_client->requestKeepScreenAwake(keepScreenAwake);

[mlamouri (slow - plz ping), 2015/05/05 13:45:44]

It seems that you will have problems when the frame is detached...

[alogvinov, 2015/05/06 09:12:34]

Could you please elaborate? It seems that e.g. GeolocationContoller does the
same thing.

[mlamouri (slow - plz ping), 2015/05/06 10:03:42]

Geolocation.cpp will do early returns if there is no frame. Note that there are
tests that should catch if there are obvious issues with detached frames.
Generally speaking, you might want to run try jobs for this CL if you haven't
yet.

+    }

[mlamouri (slow - plz ping), 2015/05/05 13:45:44]

nit: no need for {}

+}
+
+} // namespace blink