Pyauto perf tests now wait for idle CPU after pyauto.PyUITest.setUp().
Pyauto perf tests now wait for idle CPU after pyauto.PyUITest.setUp().

Waiting for idle CPU before calling pyauto.PyUITest.setUp() was problematic,
because the killing/init of Chrome occurs within pyauto.PyUITest.setUp().

BUG=chromium-os:25662
TEST=Verified CPU goes idle on Flash tests only after making this change.

Review URL: https://chromiumcodereview.appspot.com/9303017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@119795 0039d316-1c4b-4281-b951-d872f2087c98

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