The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ee559102b866a30486a95ffc7b30f9547c007eb1

commit ee559102b866a30486a95ffc7b30f9547c007eb1
Author: gambard <gambard@chromium.org>
Date: Tue Jun 06 15:37:22 2017

Hide the ink for the custom-design cells

The custom designed cells, like the most visited tiles should not have ink
displayed during interaction.

BUG= 724493 

Review-Url: https://codereview.chromium.org/2927563002
Cr-Commit-Position: refs/heads/master@{#477295}

[modify] https://crrev.com/ee559102b866a30486a95ffc7b30f9547c007eb1/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d57638fdda374318c746e30f29ab35e4b1a7066f

commit d57638fdda374318c746e30f29ab35e4b1a7066f
Author: Gauthier Ambard <gambard@chromium.org>
Date: Tue Sep 12 16:23:02 2017

Hides the ink using dedicated method

To hide the ink on the empty items, ContentSuggestions was using a
transparent color for the ink instead of not starting the animation due
to an MDC bug. As the bug is fixed, the correct method can be used.

Bug:  724493 
Change-Id: Id4a63ddcc9977b9c017f882bcf17c2a026ee13b2
Reviewed-on: https://chromium-review.googlesource.com/663340
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501300}
[modify] https://crrev.com/d57638fdda374318c746e30f29ab35e4b1a7066f/ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm

To verify:
1. Open ContentSuggestions
2. Tap/Long press on a Most Visited tile

No ink should be displayed (same behavior as now).