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After calling Browser.setWindowBounds values of the window.outerWidth/outerHeight
are now updated to reflect new bounds. In headless browser WebContentsViewMac is
created with null WebContentsViewDelegate hence there is no top level native
window. In this change we pretend that there is such window and propagate its
using newly introduced SetWindowFrameInScreen method.

Bug: none
Change-Id: I3bb4338ed28c2d477736bc1cc5976b873a3061d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321409
Commit-Queue: Yury Semikhatsky <yurys@chromium.org>
Auto-Submit: Yury Semikhatsky <yurys@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792540}