[Sync] Add datatype controller support for tracking association stats

SyncMergeResult is a new class that allows datatypes and sync itself to record
association information for later use by the debug info listener. We introduce
the class and add some plumbing at the DTC level to pass these on to the
model association manager (and from there to the debug listener).

Similarly, to track syncer changes, we pass a SyncMergeResult weak pointer
to the SharedChangeProcessor, which while it's valid will increment the deltas
as changes arrive (in a future patch). The weak pointer is invalidated at the end
of association by the DTC.

To simplify the DTC plumbing of merge results, StartFailed has been merged
into StartDone. Additionally, removed some old logging code attempting to
identify which datatype was being Stopped that isn't necessary anymore.

BUG=158576

Review URL: https://chromiumcodereview.appspot.com/11401002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167528 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 1 deletions

diff --git a/chrome/browser/sync/glue/shared_change_processor.cc b/chrome/browser/sync/glue/shared_change_processor.cc
index 1e536d1..324e7a4 100644
--- a/chrome/browser/sync/glue/shared_change_processor.cc
+++ b/chrome/browser/sync/glue/shared_change_processor.cc
@@ -49,7 +49,8 @@ base::WeakPtr<syncer::SyncableService> SharedChangeProcessor::Connect(
     ProfileSyncComponentsFactory* sync_factory,
     ProfileSyncService* sync_service,
     DataTypeErrorHandler* error_handler,
-    syncer::ModelType type) {
+    syncer::ModelType type,
+    const base::WeakPtr<syncer::SyncMergeResult>& merge_result) {
   DCHECK(sync_factory);
   DCHECK(sync_service);
   DCHECK(error_handler);
@@ -68,6 +69,8 @@ base::WeakPtr<syncer::SyncableService> SharedChangeProcessor::Connect(
     disconnected_ = true;
     return base::WeakPtr<syncer::SyncableService>();
   }
+
+  // TODO(zea): Pass |merge_result| to the generic change processor.
   generic_change_processor_ =
       sync_factory->CreateGenericChangeProcessor(sync_service_,
                                                  error_handler,