Add platform apps switch to chrome://flags.
Add platform apps switch to chrome://flags.


BUG=none
TEST=manually verified appearance and functionality.


Review URL: http://codereview.chromium.org/10213008

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@133798 0039d316-1c4b-4281-b951-d872f2087c98

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