commit 5bb223676defeba9c44a5ce42460c86e24561e73
author Ehsan Karamad <ekaramad@chromium.org> Wed Jan 09 15:53:27 2019
committer Commit Bot <commit-bot@chromium.org> Wed Jan 09 15:53:27 2019
tree c0388b08743960cad665af9c3b9dc8c9e75fae46
parent f8119b9be8440b231a19c0b4019310cfa8065433

[GuestView] - Introduce MimeHandlerViewAttachHelper

This CL is for the most part a mechanical change which extracts almost
all the frame-based MimeHandlerView code out of
ExtensionsGuestViewMessageFilter. This change both removes the current
clutter form EGVMF as well as fixesa race introduced when the
frame-based logic was added to EGVMF. The reason for the race was that
EGVMF is destroyed on IO thread but all the access to it (for
frame-based MHV) are from UI.

TBR=avi@chromium.org,lazyboy@chromium.org

Bug: 659750, 896679, 911161, 918861
Change-Id: I6474b870e4d56daa68be03637bb633665d9f9dda
Reviewed-on: https://chromium-review.googlesource.com/c/1401451
Commit-Queue: Ehsan Karamad <ekaramad@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Ehsan Karamad <ekaramad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621155}