Plumb Push API permission request through Blink using Frame.

Source/modules/push_messaging/PushPermissionClient.cpp

Index: Source/modules/push_messaging/PushPermissionClient.cpp
diff --git a/Source/modules/push_messaging/PushPermissionClient.cpp b/Source/modules/push_messaging/PushPermissionClient.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e0bcdabd0149017715b2edc5d9889fc45632715f
--- /dev/null
+++ b/Source/modules/push_messaging/PushPermissionClient.cpp
@@ -0,0 +1,38 @@
+// 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/push_messaging/PushPermissionClient.h"
+
+#include "core/dom/Document.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/frame/LocalFrame.h"
+
+namespace blink {
+
+const char* PushPermissionClient::supplementName()
+{
+    return "PushPermissionClient";
+}
+
+PushPermissionClient* PushPermissionClient::from(ExecutionContext* context)
+{
+    if (!context->isDocument())
+        return nullptr;
+
+    const Document* document = toDocument(context);
+    ASSERT(document->frame());
+
+    if (!document->frame()->isLocalFrame())
+        return nullptr;
+
+    return static_cast<PushPermissionClient*>(WillBeHeapSupplement<LocalFrame>::from(document->frame(), supplementName()));
+}
+
+void providePushPermissionClientTo(LocalFrame& frame, PassOwnPtrWillBeRawPtr<PushPermissionClient> client)
+{
+    frame.provideSupplement(PushPermissionClient::supplementName(), client);
+}
+
+}