Added an argument to AddDomMutationObserver and WaitForDomNode automation hooks to allow the use of arbitrary javascript injection functions.
Added an argument to AddDomMutationObserver and WaitForDomNode automation hooks to allow the use of arbitrary javascript injection functions.

This is necessary to support their use anywhere javascript can be injected.

BUG=None
TEST=functional/apptest.py


Review URL: http://codereview.chromium.org/10218006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@133952 0039d316-1c4b-4281-b951-d872f2087c98

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