Mark all images dirty when the user requests image annotations once.

This will ensure the annotator gets notified of all page images.

Bug: 905419
Change-Id: I6634797ff8e00288977240b43c081838683d9a5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1495805
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637355}
2 files changed