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

chrome/browser/page_load_metrics/observers/offliner_user_data.h

+// 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_PAGE_LOAD_METRICS_OBSERVERS_OFFLINER_USER_DATA_H_
+#define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_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> {

[Pete Williamson, 2017/05/16 17:51:19]

Reviewers:  This is a kind of odd place for the UserData, but everything
compiles here for now.  As soon as Dimich lands the chrome/browser/offline_pages
directory change (before I check this in), I plan to move this class to that
directory.

The file is here now to avoid putting it under an "android" directory, and
because I couldn't get it to be a proper dependency in components.

[RyanSturm, 2017/05/16 17:56:30]

If this is just because it wasn't building
resource_tracking_page_load_metrics_observer.cc on desktop. Is it possible to
leave it where it is for now (android/ code) and have an #if defined(OS_ANDROID)
around the code in OnCommit() and return STOP_OBSERVING if its desktop?

[Pete Williamson, 2017/05/17 16:53:42]

And the file is now moved to its new home, chrome/browser/offline_pages.

+ 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_PAGE_LOAD_METRICS_OBSERVERS_OFFLINER_USER_DATA_H_