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This is the second and final patch of changes for implementing the per datatype throttling feature. Includes the tests.

This consumes the throttled datatypes set in the context and uses that to filter the unsynced handles that we use for committing.

BUG=104819
TEST=unit_tests.exe, sync_unit_tests.exe, sync_integration_tests.exe, manual test cases


Review URL: http://codereview.chromium.org/8631021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111464 0039d316-1c4b-4281-b951-d872f2087c98