This CL shows bit more detail of value collision.

Change-Id: I612f1a80cf160e7eebb2b48f0ddd1b8f9aaa81b1
Reviewed-on: https://chromium-review.googlesource.com/c/1475265
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>