Adds the concept of a 'safe mode' hotkey start

The issue is that with Aura if something goes horribly wrong with the GPU, the user can get a 'black window' with no UI.

So for ConOps it is nice to have a way to start chrome with a set of flags that we know should get you a working chrome that they can troubleshoot.

To do this we add a hotkey combo to the start menu shortcut, in this case ctrl-shift-f10 which is not taken by windows. This shortcut can start chrome in this safe mode.

BUG=271719
TEST=see bug
R=robertshield@chromium.org

Review URL: https://codereview.chromium.org/57173002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232825 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232825
Properly complete sending feedback reports when a trace is attached

R=rkc@chromium.org
BUG=314277

Review URL: https://codereview.chromium.org/56443004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232826 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232826