Adds extension name to the screencast notification bar.
Also adds the web content origin to the window picker text.
No change to both text if the extension itself is requesting the stream, instead of sharing it with a tab. Screen sharing without window picker (i.e. chromeMediaSource:screen) is not affected.

BUG=341729

Review URL: https://codereview.chromium.org/186133005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255581 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255581
[telemetry] Add ability to read data previously written to HTML

This lets telemetry read the data that was previously put into an
html viewer file.

BUG=340096

Review URL: https://codereview.chromium.org/183973020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255582 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255582