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This CL splits kVizForWebView feature flag into kVizForWebView and
kVizFrameSubmissionForWebView. As we made decision to try reuse old
path for frame submission the code that implements it needs to be
under different flag.

Bug: 805739
Change-Id: I0040cc0af8305d75612315967afa3bbf3915456a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015496Reviewed-by: Stefan Zager <szager@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734267}