Relands: Android perf tests: kill adbd on the device after running a test.

There's some data indicating that adbd on the device sometimes
spontaneously restores its connection.
After running a test, let's kill adbd and forwarder and wait for bit.

This is a speculative change to try to make the bots healthier.
Relands crrev.com/226762: will also kill the forwarder.

BUG=

Review URL: https://codereview.chromium.org/25982005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227038 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227038
Trace viewer roll 1006 -> 1022

NOTRY=True
TBR=nduca

Review URL: https://codereview.chromium.org/25818002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227039 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227040 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227039
SVN changes up to revision 227040