GitLab

cl/303855538 will add a save copy function to the clientAPI delegate,
this CL adds the chromium side code to implement this function. The save
copy delegate function simply prompts the user to pick a file location,
dumps a provided blob into the file specified, then relaunches the media
app with this new file.

Bug: 996088, b/141587270
Change-Id: I97b253fbffa9e1efb75448c98d41c3cee893bf19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134028
Commit-Queue: Zain Afzal <zafzal@google.com>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758688}