DevTools: Reset scaling to 1 on a cross process navigation

If a renderer is swapped out, it won't send a ScaleChanged message
unless it has a non-1 scale. This patch resets the scale of
input_handler to 1 on a cross process navigation.

Bug: 929806
Change-Id: I3d4a2a1fbf07286870a2c375b330d86caa9e38ea
Reviewed-on: https://chromium-review.googlesource.com/c/1464115
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Joel Einbinder <einbinder@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633513}
3 files changed