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This patch separates out creation of WebLayer to a WebLayerFactory and
has the client supply the version of chrome the client was compiled with.
WebLayerFactory also offers functions to return the version of the
implementation. This does not change the existing versioning checks, rather
adds the real chrome version. The goal is we will eventually use the real
chrome version and not the one of version we added.

BUG=1025615
TEST=all tests implicitly trigger the new code paths

Change-Id: Ie6330a57fd9f205504758c9cde9707537cb643f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935037
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720825}