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This changes the hook-up of mac web tests to resize the top level
RenderWidgetHostView as soon as the renderer-side objects are created
so that the correct screen rects can be sent to the renderer. Previously
it was hooked up to the asynchronous RenderViewReady() which made it
race with the renderer running the test, a race it happened to win. Now
we do it when
a) The main RenderFrame is created (along with its renderer-side widget)
b) A new window/webcontents is created, and it already has a renderer-
   side main frame when it is wrapped in a Shell.

This will allow us to change the browser-side code notifying about
renderer objects being created without breaking these tests in
https://chromium-review.googlesource.com/c/chromium/src/+/2597851 .

R=dcheng@chromium.org

Bug: 1158869
Change-Id: I645d67c705a9390853c052804edbd07eaea91c95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606520
Auto-Submit: danakj <danakj@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839784}