Plumb Push API permission request through Blink using Frame.

Source/modules/push_messaging/PushPermissionClient.h

+// 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.
+
+#ifndef PushPermissionClient_h
+#define PushPermissionClient_h
+
+#include "platform/Supplementable.h"
+#include "public/platform/WebCallback.h"
+#include "wtf/PassOwnPtr.h"
+
+namespace blink {
+
+class ExecutionContext;
+class LocalFrame;
+
+class PushPermissionClient : public WillBeHeapSupplement<LocalFrame> {
+public:
+    virtual ~PushPermissionClient() { }
+
+    // Requests user permission to use the Push API from the origin of the
+    // current frame. The provided callback will be run when a decision has been
+    // made.
+    virtual void requestPermission(ExecutionContext*, WebCallback*) = 0;
+
+    // WillBeHeapSupplement requirements.
+    static const char* supplementName();
+    static PushPermissionClient* from(ExecutionContext*);
+};
+
+void providePushPermissionClientTo(LocalFrame&, PassOwnPtrWillBeRawPtr<PushPermissionClient>);
+
+} // namespace blink
+
+#endif // PushPermissionClient_h