Add a way to send the resource percentage signal to the RC.

chrome/browser/offline_pages/offliner_user_data.h

Index: chrome/browser/offline_pages/offliner_user_data.h
diff --git a/chrome/browser/offline_pages/offliner_user_data.h b/chrome/browser/offline_pages/offliner_user_data.h
new file mode 100644
index 0000000000000000000000000000000000000000..01e868959245524b9b3c51e9a907ddf98b7cab68
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+++ b/chrome/browser/offline_pages/offliner_user_data.h
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+// Copyright 2017 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_OFFLINE_PAGES_OFFLINER_USER_DATA_H_
+#define CHROME_BROWSER_OFFLINE_PAGES_OFFLINER_USER_DATA_H_
+
+#include "components/offline_pages/core/background/offliner.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+namespace offline_pages {
+
+class OfflinerUserData : public content::WebContentsUserData<OfflinerUserData> {
+ public:
+  static void AddToWebContents(content::WebContents* webcontents,
+                               Offliner* offliner);
+
+  static Offliner* OfflinerFromWebContents(content::WebContents* webcontents);
+
+  explicit OfflinerUserData(Offliner* offliner) { offliner_ = offliner; }
+  Offliner* offliner() { return offliner_; }
+
+ private:
+  // The offliner that the WebContents is attached to. The offliner owns the
+  // Delegate which owns the WebContents that this data is attached to.
+  // Therefore, its lifetime should exceed that of the WebContents, so this
+  // should always be non-null.
+  Offliner* offliner_;
+};
+
+}  // namespace offline_pages
+
+#endif  // CHROME_BROWSER_OFFLINE_PAGES_OFFLINER_USER_DATA_H_