[USS] Show USS counters in Types tab

components/sync/engine_impl/cycle/data_type_debug_info_emitter.h

Index: components/sync/engine_impl/cycle/data_type_debug_info_emitter.h
diff --git a/components/sync/engine_impl/cycle/directory_type_debug_info_emitter.h b/components/sync/engine_impl/cycle/data_type_debug_info_emitter.h
similarity index 53%
copy from components/sync/engine_impl/cycle/directory_type_debug_info_emitter.h
copy to components/sync/engine_impl/cycle/data_type_debug_info_emitter.h
index 8334abec8101a2d1c2c9ec977de0eb2087b85122..8e620a712c5f63b5ed2dd81271b53024367c297b 100644
--- a/components/sync/engine_impl/cycle/directory_type_debug_info_emitter.h
+++ b/components/sync/engine_impl/cycle/data_type_debug_info_emitter.h
@@ -1,18 +1,17 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
-#define COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
+#ifndef COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DATA_TYPE_DEBUG_INFO_EMITTER_H_
+#define COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DATA_TYPE_DEBUG_INFO_EMITTER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/observer_list.h"
-#include "base/values.h"
+#include "components/sync/base/model_type.h"
 #include "components/sync/engine/cycle/commit_counters.h"
 #include "components/sync/engine/cycle/update_counters.h"
-#include "components/sync/syncable/directory.h"
 
 namespace syncer {
 
@@ -21,39 +20,23 @@ class TypeDebugInfoObserver;
 
 // Supports various kinds of debugging requests for a certain directory type.
 //
-// The GetAllNodes() function is used to help export a snapshot of all current
-// nodes to its caller.  The complexity required to manage the request mostly
-// lives elsewhere.
-//
 // The Emit*() functions send updates to registered TypeDebugInfoObservers.
-// The DirectoryTypeDebugInfoEmitter does not directly own that list; it is
+// The DataTypeDebugInfoEmitter does not directly own that list; it is
 // managed by the ModelTypeRegistry.
 //
 // For Update and Commit counters, the job of keeping the counters up to date
-// is delegated to the UpdateHandler and CommitContributors.  For the Stats
-// counters, the emitter will use its type_ and directory_ members to fetch all
-// the required information on demand.
-class DirectoryTypeDebugInfoEmitter {
+// is delegated to the UpdateHandler and CommitContributors. For the Stats
+// counters, the emitter will let sub class to fetch all the required
+// information on demand.
+class DataTypeDebugInfoEmitter {
  public:
-  // Standard constructor for non-tests.
-  //
-  // The |directory| and |observers| arguments are not owned.  Both may be
-  // modified outside of this object and both are expected to outlive this
-  // object.
-  DirectoryTypeDebugInfoEmitter(
-      syncable::Directory* directory,
-      ModelType type,
-      base::ObserverList<TypeDebugInfoObserver>* observers);
-
-  // A simple constructor for tests.  Should not be used in real code.
-  DirectoryTypeDebugInfoEmitter(
+  // The |observers| is not owned.  |observers| may be modified outside of this
+  // object and is expected to outlive this object.
+  DataTypeDebugInfoEmitter(
       ModelType type,
       base::ObserverList<TypeDebugInfoObserver>* observers);
 
-  virtual ~DirectoryTypeDebugInfoEmitter();
-
-  // Returns a ListValue representation of all known nodes of this type.
-  std::unique_ptr<base::ListValue> GetAllNodes();
+  virtual ~DataTypeDebugInfoEmitter();
 
   // Returns a reference to the current commit counters.
   const CommitCounters& GetCommitCounters() const;
@@ -74,25 +57,24 @@ class DirectoryTypeDebugInfoEmitter {
   void EmitUpdateCountersUpdate();
 
   // Triggers a status counters update to registered observers.
-  void EmitStatusCountersUpdate();
-
- private:
-  syncable::Directory* directory_;
+  virtual void EmitStatusCountersUpdate() = 0;
 
+ protected:
   const ModelType type_;
 
-  CommitCounters commit_counters_;
-  UpdateCounters update_counters_;
-
   // Because there are so many emitters that come into and out of existence, it
   // doesn't make sense to have them manage their own observer list.  They all
   // share one observer list that is provided by their owner and which is
   // guaranteed to outlive them.
   base::ObserverList<TypeDebugInfoObserver>* type_debug_info_observers_;
 
-  DISALLOW_COPY_AND_ASSIGN(DirectoryTypeDebugInfoEmitter);
+ private:
+  CommitCounters commit_counters_;
+  UpdateCounters update_counters_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataTypeDebugInfoEmitter);
 };
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
+#endif  // COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DATA_TYPE_DEBUG_INFO_EMITTER_H_