Add OmniboxInputInProgress User Action
Add OmniboxInputInProgress User Action

This triggers on the first keystroke in the omnibox.

It also seem to trigger if you switch to a tab that has previously
entered omnibox text (not the current URL).  The intuition behind this
is when you switch tabs to something with already partially entered
text that does not reflect the page contents, the input is in
progress.  Also, the omnibox is in focus when this happens

This latter point does not always happen in InstantExtended.
You usually get it but sometimes you do not.  In particular,
you don't get it if InstantExtended decided your omnibox input
is a search query and has already fetched results for it.  Then
when you switch back to this tab later, the omnibox input
properly reflects page contents; you don't get omnibox input
in progress.  If, on the other hand, you switch away before it
fetches the page or the top suggestion is a URL (and hence
not fetched at all), then when you return the page you see
OmniboxInputInProgress.

BUG=

Review URL: https://chromiumcodereview.appspot.com/12086002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@180536 0039d316-1c4b-4281-b951-d872f2087c98

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