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Now it monitors mouse/touch/gesture events and hides the tooltip if necessary.
Previous CL (crrev.com/148079) was reverted since it causes use-after-free error.
It happens when the 'LauncherTooltipBubble' widget exists but LauncherTooltipManager
is already released.  In that case, the widget's release will cause WindowClosing()
which calls host_->OnBubbleClosed(), but host_ is already released.
Thus I'd make sure to introduce a method to set host_ to NULL in case that
LauncherTooltipManager explicitly clean-up the Bubble.

R=derat@chromium.org
BUG=137678
TEST=manually checked on linux, aura_shell_unittests passed with asan


Review URL: https://chromiumcodereview.appspot.com/10808102

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148308 0039d316-1c4b-4281-b951-d872f2087c98