The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bb7663f3431fd1ad9b0f588f1732f4208ac12011

commit bb7663f3431fd1ad9b0f588f1732f4208ac12011
Author: Yafei Duan <romax@chromium.org>
Date: Tue Jul 17 01:33:15 2018

[NTP Tile] Adding flag for homepage tile.

Adding a new flag for controlling whether homepage tile should be used
and inserted into Most Visited tiles on New Tab Page. This will be
checked along with NTPButton Enabled.

Default value is enabled.

Change-Id: I37ba92a2fe0b40c2c682adf1d34d6306242ece53
Bug:  864191 
Reviewed-on: https://chromium-review.googlesource.com/1134587
Commit-Queue: Yafei Duan <romax@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575514}
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/android/java/src/org/chromium/chrome/browser/preferences/ChromePreferenceManager.java
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/android/java/src/org/chromium/chrome/browser/suggestions/MostVisitedSitesBridge.java
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/android/java/src/org/chromium/chrome/browser/util/FeatureUtilities.java
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/browser/about_flags.cc
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/browser/android/chrome_feature_list.cc
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/browser/android/chrome_feature_list.h
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/bb7663f3431fd1ad9b0f588f1732f4208ac12011/tools/metrics/histograms/enums.xml