Reland "linux: Fix grabs for popups belonging to ..."

This relands r135966, which was reverted by r136293.  By
adding the popup to its parent's window group, the DevTools
profiler heap snapshot combobox receives mouse input again.
I'm still not sure why this is necessary.

Original description:

When displaying a popup for an inactive tab, grab input on
behalf of the popup's window rather than its parent window.

[snip obsolete, now-removed window group change]

BUG=126296
TEST=manual: original test case is still fine; dev tool regression described in r136293 is gone


Review URL: https://chromiumcodereview.appspot.com/10389080

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@136451 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed