Cherry-pick "Add setting for disabling compositor touch hit testing"

Bug 11070366

Taken from
https://src.chromium.org/viewvc/blink?view=revision&revision=158956 plus
ScrollingCoordinator.cpp updated with additional #include not present in
the M30 branch.

Original description:

BUG=303945

Review URL: https://codereview.chromium.org/25507008

Change-Id: Ifd72104105cd19dde5393ef901e6d45145ae02fc
git-svn-id: svn://svn.chromium.org/blink/trunk@158956 bbb929c8-8fbe-4397-9dbb-9b2b20218538
7 files changed