telemetry: Increase rasterize_and_record timeout to 15s.

R=tonyg@chromium.org,rmcilroy@chromium.org
BUG=317141
NOTRY=True

Review URL: https://codereview.chromium.org/68453003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234269 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234269
Adds a button to copy the screenshot result to the clipboard.

BUG=179088
R=jamescook@chromium.org
TEST=manually

Review URL: https://codereview.chromium.org/66803005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234270 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234270