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This CL adds a feedback button for users to submit feedback regarding
the screen capture feature. This button will only exist for M-88 dog
food, and will be removed in M-89.

By default, the template is pre-populated with "#ScreenCapture" to allow
us to search easily in Listnr/.

Included is also some minor refactoring to make capture mode buttons
more generic, as well as adding an optional |description_template|
parameter to the chrome OpenFeedbackDialog method.

Test: manual, added minor test
Change-Id: Ie04c30664744187d363765c43b60b955febf0d0a
Fixed: 1142948
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508402
Commit-Queue: Richard Chui <richui@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823442}