[Android] Use DIP coordinates for GestureFlingStart events

The OverScroller used to generate fling updates on Android works in pixel space.
Consequently, GestureFlingStart velocities were forwarded also in pixel space.
This exceptional case is unnecessary and confusing, as all other gestures
components are provided as DIPs.  Adopt DIPs for GestureFlingStart, instead
scaling the velocity to pixels when generating the OverScroller object.

BUG=332418

Review URL: https://codereview.chromium.org/170993003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251963 0039d316-1c4b-4281-b951-d872f2087c98
Cleanup: Make --debug-print Windows-only.

Review URL: https://codereview.chromium.org/163183012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251964 0039d316-1c4b-4281-b951-d872f2087c98
Write telemetry-specific network interface file.
Avoid sudo for stopping network-manager if already stopped.

BUG=

Review URL: https://codereview.chromium.org/169513003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251965 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251964
SVN changes up to revision 251965