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Before, it was possible for two gesture recognizers to be simulatneously
recognized. E.g. panning the toolbar while scrolling or panning both the
tab strip and the toolbar. This caused lots of problems.

This CL lets the ViewRevealingVerticalPanHandler track which gesture
recognizer it is currently handling. While it is handling one, all other
gestures are ignored.

Bug: 1161209, 1163518
Change-Id: I3525cfd670a08a5b88166dd5d8c647b7a9b437f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618000Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Javier Flores <javierrobles@chromium.org>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#842529}