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An exo surface is collapsed into a single CompositorFrame during
presentation; if there is an aura window displaying webcontents it
will be rendered on top of all exo content due to the actual viz
layer structure

This replaces the contents of an exo layer with the web contents
by emitting a SurfaceDrawQuad instead, drawing the web contents in
the correct position

As a consequence the aura window corresponding to the web contents
is hidden as we do not want it drawn in the usual aura manner

Bug: b/141980352
Test: desktop build w/ webview
Change-Id: If45aa68e80f115f36ef0edee34f03c09f06dfcf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850366Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705112}