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... so that it can be used on more testing files.

Note that, given that one of the methods reimplemented need access
blink::WebLocalFrame, the newly added files can not reside in
renderer/platform/testing, where other similar files are.

BUG=787254
R=guidou@chromium.org

Change-Id: I1dd6154407d744daab6cdbad0003bf2ddafe7485
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873986
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#709074}