Add 'Dump Database' tab to syncfs-internals (only for v2 for now)

chrome/browser/sync_file_system/remote_file_sync_service.h

Index: chrome/browser/sync_file_system/remote_file_sync_service.h
diff --git a/chrome/browser/sync_file_system/remote_file_sync_service.h b/chrome/browser/sync_file_system/remote_file_sync_service.h
index 589b594c10f23bde75217a0548d700aab8c46c8e..9c00a4082ddef9da15de34e3a2efb6c6a087b872 100644
--- a/chrome/browser/sync_file_system/remote_file_sync_service.h
+++ b/chrome/browser/sync_file_system/remote_file_sync_service.h
@@ -192,6 +192,9 @@ class RemoteFileSyncService {
   // Returns file metadata for |origin|.
   virtual scoped_ptr<base::ListValue> DumpFiles(const GURL& origin) = 0;
 
+  // Returns the dump of internal database.
+  virtual scoped_ptr<base::ListValue> DumpDatabase() = 0;
+
   // Enables or disables the background sync.
   // Setting this to false should disable the synchronization (and make
   // the service state to REMOTE_SERVICE_DISABLED), while setting this to