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The eyedropper tool currently depends on being notified about arrival
of CompositorFrames from the renderer which is incompatible with the
VizDisplayCompositor feature. If viz is enabled, use the new video
capture API with is compatible with viz.

TBR=jam@chromium.org

Bug: 771336
Change-Id: I3e0edaf9cc467045a00fa05212ce79cfd58065c9
Reviewed-on: https://chromium-review.googlesource.com/949885
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542299}