The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/28574ad090e3bdeb2a57b03f1da19aff92d65d7c

commit 28574ad090e3bdeb2a57b03f1da19aff92d65d7c
Author: fgorski <fgorski@chromium.org>
Date: Tue May 09 18:49:50 2017

[Offline pages] Update of OfflinePageUtils for better testability

This patch introduces Internal interface that is mockable and simplifies
testing classes dependent on OfflinePageUtils.

BUG= 711771 
R=dewittj@chromium.org

Review-Url: https://codereview.chromium.org/2836333004
Cr-Commit-Position: refs/heads/master@{#470393}

[modify] https://crrev.com/28574ad090e3bdeb2a57b03f1da19aff92d65d7c/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageTabObserver.java
[modify] https://crrev.com/28574ad090e3bdeb2a57b03f1da19aff92d65d7c/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
[modify] https://crrev.com/28574ad090e3bdeb2a57b03f1da19aff92d65d7c/chrome/android/java_sources.gni
[modify] https://crrev.com/28574ad090e3bdeb2a57b03f1da19aff92d65d7c/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/OfflinePageTabObserverTest.java
[rename] https://crrev.com/28574ad090e3bdeb2a57b03f1da19aff92d65d7c/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtilsTest.java

If this is about moving more methods to the interface, this can be done as/if needed.