Use 1ms CPU profiler sampling interval on Android by default

This CL changes default sampling interval on Android from 5ms to 1ms so that it is the same on all platforms. All perf tests on modern devices (Galaxy Nexus, Nexus 7) show that 1ms should be long enough for profiling on mobile devices.

BUG=None
R=bmeurer@chromium.org, loislo@chromium.org

Review URL: https://codereview.chromium.org/23927005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16526 ce2b1a6d-e550-0410-aec6-3dcde31c8c00