A helper class for calling RegisterWaitForSingleObject with the objective of finding out when objects get signaled.

The API is pretty simple:
-  consumer can associate a Task with a HANDLE via AddWatch method
-  when the HANDLE is signaled, we run the Task on the thread that called AddWatch
-  the consumer can call CancelWatch to abort the watch
-  a watch is one-shot:  after the object is signaled, the consumer has to call AddWatch again to wait a second time
-  if the ObjectWatcher instance is destroyed, it cancels all associated watches.

Implementation details:
-  Uses RegisterWaitForSingleObject to run a function on the wait thread.  This avoids extra thread marshaling to a worker thread.
-  Uses a Task to get back onto the origin thread.  This is possible due to the UnregisterWaitEx(INVALID_HANDLE_VALUE) call.
-  Once on the origin thread, runs the consumer's Task directly.

This is the first part of changes I want to make to MessageLoop::WatchObject.  For now, I have not made any changes to existing code.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@259 0039d316-1c4b-4281-b951-d872f2087c98

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