sync: Add interfaces for per-type sync

sync/engine/commit_processor.h

Index: sync/engine/commit_processor.h
diff --git a/sync/engine/commit_processor.h b/sync/engine/commit_processor.h
index 9ab09576797e35402d3408a4aec0a007b687032a..8085e08fe09d967b38799ea92a2e9a4c6647c15c 100644
--- a/sync/engine/commit_processor.h
+++ b/sync/engine/commit_processor.h
@@ -20,8 +20,8 @@ namespace syncable {
 class Directory;
 }  // namespace syncable
 
-class SyncDirectoryCommitContributor;
-class SyncDirectoryCommitContribution;
+class CommitContributor;
+class CommitContribution;
 
 // This class manages the set of per-type committer objects.
 //
@@ -31,7 +31,7 @@ class SyncDirectoryCommitContribution;
 // contains a type which was not previously registered.
 class SYNC_EXPORT_PRIVATE CommitProcessor {
  public:
-  typedef std::map<ModelType, SyncDirectoryCommitContribution*> ContributionMap;
+  typedef std::map<ModelType, CommitContribution*> ContributionMap;
 
   explicit CommitProcessor(CommitContributorMap* commit_contributor_map);

[tim (not reviewing), 2014/02/18 19:15:01]

Comment on parameter (at least ownership / lifetime expectation).

[rlarocque, 2014/02/18 20:01:13]

Done.

   ~CommitProcessor();