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

chrome/browser/page_load_metrics/page_load_metrics_initialize.h

 // Copyright 2015 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_PAGE_LOAD_METRICS_INITIALIZE_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_INITIALIZE_H_
 
 #include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace chrome {
 
-void InitializePageLoadMetricsForWebContents(
-    content::WebContents* web_contents);
+void InitializePageLoadMetricsForWebContents(content::WebContents* web_contents,

[Charlie Harrison, 2017/05/17 23:56:24]

Can you document this bool here?

[Pete Williamson, 2017/05/24 01:01:50]

Done.

+                                             bool background_rendering);

[Bryan McQuade, 2017/05/23 05:00:01]

this name 'background_rendering' feels overly specific to be a parameter to this
function.

i'll need to look at this a bit more, but my initial reaction is we may want to
change the way this is structured a bit.

[Pete Williamson, 2017/05/24 01:01:50]

What do you think of a separate init function for just initializing the metrics
we want in background mode?

 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_INITIALIZE_H_