activity_log stores the zoom_state

This patch adds the zoom_state data to the logged details of the
pinch zoom gestures.

BUG=none
TEST=Manually generated a new feedback report and reviewed the
result in visualizer

Change-Id: I1555c6653d0d4b53e82de232bd2f379016d5632c
Reviewed-on: https://chromium-review.googlesource.com/329269
Commit-Ready: Amirhossein Simjour <asimjour@chromium.org>
Tested-by: Amirhossein Simjour <asimjour@chromium.org>
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
5 files changed