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Screenshots can be added for both grd and grdp files. The current
upload tool only finds screenshots for grd files. This CL adds
support for grdp files and files added via <structure> tags.

Bug: 814901
Change-Id: I2cb427b502e050c1b3ee6e39fa7bd94f26e54060
Reviewed-on: https://chromium-review.googlesource.com/974657Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545142}