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This is a reland of 310bb105

Original change's description:
> Progress on the Revamped context menu
> 
> This CL consists of:
> - Improvements for URL formatting (i18n and emphasizing)
> - Addition of grey background while loading
> - Addition of favicons, monograms, and thumbnails
> - Addition of checkered pattern behind the transparent PNGs
> - Some visual polish and fixes
> 
> Bug: 655359
> Change-Id: I6ebf13b6097780db22c05804f2b9cdf6d1ee8461
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1595114
> Reviewed-by: Theresa <twellington@chromium.org>
> Commit-Queue: Sinan Sahin <sinansahin@google.com>
> Cr-Commit-Position: refs/heads/master@{#659233}

Bug: 655359
Change-Id: Ie3d559eb0c353aef2eecf56cf36bcc29d41ec4ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610854Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Sinan Sahin <sinansahin@google.com>
Cr-Commit-Position: refs/heads/master@{#659763}