Pass the testing interface command line switch to Chrome when running the PPAPI UI tests.
Pass the testing interface command line switch to Chrome when running the PPAPI UI tests.

TEST=this is a test
BUG=none
Review URL: http://codereview.chromium.org/2736007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@49589 0039d316-1c4b-4281-b951-d872f2087c98

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