GitLab

GTK: Add TRACE_EVENTs around gtk ui events so select tasks related to the GTK user interface show up on the chrome://tracing hierarchical profiler.

These were useful for tracking down tab changing speed problems.

BUG=none
TEST=none


Review URL: http://codereview.chromium.org/8800029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113939 0039d316-1c4b-4281-b951-d872f2087c98