[USS] Show USS counters in Types tab

components/sync/engine_impl/cycle/directory_type_debug_info_emitter.h

Index: components/sync/engine_impl/cycle/directory_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/directory_type_debug_info_emitter.h
index 8334abec8101a2d1c2c9ec977de0eb2087b85122..ba2daab91a9e494da638613f675e69275be005ad 100644
--- a/components/sync/engine_impl/cycle/directory_type_debug_info_emitter.h
+++ b/components/sync/engine_impl/cycle/directory_type_debug_info_emitter.h
@@ -5,41 +5,15 @@
 #ifndef COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
 
-#include <memory>
-
 #include "base/macros.h"
-#include "base/observer_list.h"
-#include "base/values.h"
-#include "components/sync/engine/cycle/commit_counters.h"
-#include "components/sync/engine/cycle/update_counters.h"
+#include "components/sync/engine_impl/cycle/data_type_debug_info_emitter.h"
 #include "components/sync/syncable/directory.h"
 
 namespace syncer {
 
-class DirectoryCommitContributor;
-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
-// 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 {
+class DirectoryTypeDebugInfoEmitter : public 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,
@@ -50,46 +24,14 @@ class DirectoryTypeDebugInfoEmitter {
       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();
-
-  // Returns a reference to the current commit counters.
-  const CommitCounters& GetCommitCounters() const;
-
-  // Allows others to mutate the commit counters.
-  CommitCounters* GetMutableCommitCounters();
-
-  // Triggerss a commit counters update to registered observers.
-  void EmitCommitCountersUpdate();
-
-  // Returns a reference to the current update counters.
-  const UpdateCounters& GetUpdateCounters() const;
-
-  // Allows others to mutate the update counters.
-  UpdateCounters* GetMutableUpdateCounters();
-
-  // Triggers an update counters update to registered observers.
-  void EmitUpdateCountersUpdate();
+  ~DirectoryTypeDebugInfoEmitter() override;
 
   // Triggers a status counters update to registered observers.
-  void EmitStatusCountersUpdate();
+  void EmitStatusCountersUpdate() override;
 
  private:
   syncable::Directory* directory_;
 
-  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);
 };