[Telemetry] Don't create a new Tab object at each navigation.

This patch prevents us from constructing a new Tab object at each navigation
which permits the tab contents video capture API to cache its tab contents
bounding box.

I also suspect it might help with flake and noise as we no longer connect and
disconnect so frequently and no longer depend on the python GC to do so.

BUG=

Review URL: https://codereview.chromium.org/170283006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252246 0039d316-1c4b-4281-b951-d872f2087c98
Move Android-specific xml files to remoting/resources/android/

Also added copyright notices to these files.

strings.xml has been moved to a values/ directory for consistency,
although we ultimately want to get rid of that file.

NOTRY=true

Review URL: https://codereview.chromium.org/171533011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252247 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252247
Add usrsctplib to the whitelist.

TBR=benm
NOTRY=true

Review URL: https://codereview.chromium.org/173073002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252248 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252248