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This will automatically catch thread names in several of the
child processes we are after, and it also catches the name
for a webkcore thread.

The underlying function uses a try/catch clause, which
contaminates the entire function.  As a result, I needed
to factor out that section, so that I could still call
to set the profiler thread name.  Without this, the
shared dbg build will fail to compile.

r=rtenneti
Review URL: http://codereview.chromium.org/8565036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110003 0039d316-1c4b-4281-b951-d872f2087c98