sync: Re-implement getAllNodes WebUI function

sync/sessions/model_type_registry.h

Index: sync/sessions/model_type_registry.h
diff --git a/sync/sessions/model_type_registry.h b/sync/sessions/model_type_registry.h
index 1317a6ac590ae6d116545c5c5e7b48ed1d4e5141..71d304f92a1630e57807fa5aec60ec1a673bfb43 100644
--- a/sync/sessions/model_type_registry.h
+++ b/sync/sessions/model_type_registry.h
@@ -23,12 +23,15 @@ class Directory;
 class CommitContributor;
 class DirectoryCommitContributor;
 class DirectoryUpdateHandler;
+class DirectoryTypeDebugInfoEmitter;
 class NonBlockingTypeProcessorCore;
 class NonBlockingTypeProcessor;
 class UpdateHandler;
 
 typedef std::map<ModelType, UpdateHandler*> UpdateHandlerMap;
 typedef std::map<ModelType, CommitContributor*> CommitContributorMap;
+typedef std::map<ModelType, DirectoryTypeDebugInfoEmitter*>
+    DirectoryTypeDebugInfoEmitterMap;
 
 // Keeps track of the sets of active update handlers and commit contributors.
 class SYNC_EXPORT_PRIVATE ModelTypeRegistry {
@@ -67,6 +70,7 @@ class SYNC_EXPORT_PRIVATE ModelTypeRegistry {
   // Simple getters.
   UpdateHandlerMap* update_handler_map();
   CommitContributorMap* commit_contributor_map();
+  DirectoryTypeDebugInfoEmitterMap* directory_type_debug_info_emitter_map();
 
  private:
   ModelTypeSet GetEnabledNonBlockingTypes() const;
@@ -75,6 +79,9 @@ class SYNC_EXPORT_PRIVATE ModelTypeRegistry {
   // Sets of handlers and contributors.
   ScopedVector<DirectoryCommitContributor> directory_commit_contributors_;
   ScopedVector<DirectoryUpdateHandler> directory_update_handlers_;
+  ScopedVector<DirectoryTypeDebugInfoEmitter>
+      directory_type_debug_info_emitters_;
+
   ScopedVector<NonBlockingTypeProcessorCore> non_blocking_type_processor_cores_;
 
   // Maps of UpdateHandlers and CommitContributors.
@@ -82,6 +89,11 @@ class SYNC_EXPORT_PRIVATE ModelTypeRegistry {
   UpdateHandlerMap update_handler_map_;
   CommitContributorMap commit_contributor_map_;
 
+  // Map of DebugInfoEmitters for directory types.
+  // Non-blocking types handle debug info differently.
+  // Does not own its contents.
+  DirectoryTypeDebugInfoEmitterMap directory_type_debug_info_emitter_map_;
+
   // The known ModelSafeWorkers.
   std::map<ModelSafeGroup, scoped_refptr<ModelSafeWorker> > workers_map_;