Adding memory tests to the telemetry GPU tests

Replaces content_browsertests.GpuMemoryTest

BUG=310802
R=dtu@chromium.org, kbr@chromium.org

Review URL: https://codereview.chromium.org/37973003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230866 0039d316-1c4b-4281-b951-d872f2087c98
Makes tooltip always on top

Without this tooltips while a context menu are open float behind the
context menu. AFAICT this doesn't regress 306572.

Also, I had tried the code you had here:
https://codereview.chromium.org/27551006/diff/1/ui/views/corewm/tooltip_win.cc
but that didn't seem to do it.

BUG=310604
TEST=none
R=ananta@chromium.org

Review URL: https://codereview.chromium.org/39053004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230867 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230866
SVN changes up to revision 230867