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UIPI blocks keystate across process boundaries in certain situations. To be safe we maintain our own key state and intercept calls to GetKeyState. 

BUG=86895
TEST=Adobe has test coverage.
Review URL: http://codereview.chromium.org/7529041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96069 0039d316-1c4b-4281-b951-d872f2087c98