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Boilerplate code that adds properties for download button and qrcode
bitmap.
This CL also hooks up the download button to saveBitmap utility function.

Bug: 993920
Change-Id: I1ebc7a6641a7294a1b3d9c63fd8cfdeb83fb7c31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071510Reviewed-by: Travis Skare <skare@google.com>
Reviewed-by: Tanya Gupta <tgupta@chromium.org>
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Auto-Submit: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748768}