Screenshots from in-flight patch attached.

As a P2, whether the incognito stack is visible or not is handled differently in the svelte tab switcher than it is in the regular tab switcher, so it's possible to have the bottom sheet half open over a black screen. This should be fixed for beta/stable experimentation. We need UX consideration for what this should look like since there is nothing distinguishing the normal tabs from incognito tabs in the accessibility tab switcher when CH is open.

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Issue 726034 has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7dfe6af12787999c6f219ae1df78d44608d5dc45

commit 7dfe6af12787999c6f219ae1df78d44608d5dc45
Author: twellington <twellington@chromium.org>
Date: Wed May 24 20:55:55 2017

[Android] Add OverviewListLayout to main CoordinatorLayout

Rather than adding the accessibility tab switcher layout to
R.id.content, add it to a FrameLayout in the main CoordinatorLayout
so that the Chrome Home bottom sheet can be drawn on top of it.

BUG= 724700 

Review-Url: https://codereview.chromium.org/2898243002
Cr-Commit-Position: refs/heads/master@{#474417}

[modify] https://crrev.com/7dfe6af12787999c6f219ae1df78d44608d5dc45/chrome/android/java/res/layout/main.xml
[modify] https://crrev.com/7dfe6af12787999c6f219ae1df78d44608d5dc45/chrome/android/java/src/org/chromium/chrome/browser/widget/OverviewListLayout.java

Verified on 60.0.3112.10 build