Export syncer return values to about:sync
Export syncer return values to about:sync

This shows the results of the most recent attempts to download updates
and commit items on the main about:sync page.

It improves visibility into the SyncScheduler by exposing some of the
most important inputs to scheduling decisions.  

It should help us remove some of the stranger
AllStatus/ServerConnectionManager state variables by making them
redundant.

BUG=112040,110954
TEST=

Review URL: http://codereview.chromium.org/9429064

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@123350 0039d316-1c4b-4281-b951-d872f2087c98

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