Factor out dependncy on download throttling from core download code.

chrome/browser/download/download_request_limiter_observer.h

+// Copyright (c) 2011 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 CHROME_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_LIMITER_OBSERVER_H_
+#define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_LIMITER_OBSERVER_H_
+
+#include "content/browser/tab_contents/tab_contents_observer.h"
+
+class TabContents;
+
+// Watches for user gesture notifications.
+class DownloadRequestLimiterObserver : public TabContentsObserver {

[Paweł Hajdan Jr., 2011/08/16 17:14:08]

Why don't you just make DownloadRequestLimiter a TabContentsObserver?

[jam, 2011/08/16 18:18:20]

An object can only watch one tab at a time.

+ public:
+  explicit DownloadRequestLimiterObserver(TabContents* tab_contents);
+  virtual ~DownloadRequestLimiterObserver();
+
+  // TabContentsObserver overrides.
+  virtual void DidGetUserGesture() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DownloadRequestLimiterObserver);
+};
+
+#endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_LIMITER_OBSERVER_H_