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If the requests are received before the bubble is shown, and there are main
frame requests pending, they will not be shown with the main frame requests.

Once the main frame requests have been handled, the iframe requests will be
shown in a new bubble.

All requests are flushed from the queues when a page is reloaded.

BUG=369685

Review URL: https://codereview.chromium.org/292453009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273137 0039d316-1c4b-4281-b951-d872f2087c98