Move the user interaction policy for FirstMeaningfulPaint UMA into renderer

chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.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_OBSERVERS_CORE_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_CORE_PAGE_LOAD_METRICS_OBSERVER_H_
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
 #include "components/ukm/ukm_source.h"
 
@@ skipping 158 matching lines @@
   // Size of the redirect chain, which excludes the first URL.
   int redirect_chain_size_;
 
   // True if we've received a non-scroll input (touch tap or mouse up)
   // after first paint has happened.
   bool received_non_scroll_input_after_first_paint_ = false;
 
   // True if we've received a scroll input after first paint has happened.
   bool received_scroll_input_after_first_paint_ = false;
 
-  base::TimeTicks first_user_interaction_after_first_paint_;
   base::TimeTicks first_paint_;
 
   DISALLOW_COPY_AND_ASSIGN(CorePageLoadMetricsObserver);
 };
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_CORE_PAGE_LOAD_METRICS_OBSERVER_H_