Add MDP for TabRestorer.

components/sessions/core/persistent_tab_restore_service.cc

Index: components/sessions/core/persistent_tab_restore_service.cc
diff --git a/components/sessions/core/persistent_tab_restore_service.cc b/components/sessions/core/persistent_tab_restore_service.cc
index d9266e74d7cad5b8485877b15e9ef4c1c194c1e7..c50da6f41653df8ebcc9c6dee6283426290f4486 100644
--- a/components/sessions/core/persistent_tab_restore_service.cc
+++ b/components/sessions/core/persistent_tab_restore_service.cc
@@ -20,6 +20,7 @@
 #include "base/stl_util.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "base/time/time.h"
+#include "base/trace_event/memory_dump_manager.h"
 #include "components/sessions/core/base_session_service.h"
 #include "components/sessions/core/base_session_service_commands.h"
 #include "components/sessions/core/base_session_service_delegate.h"
@@ -890,9 +891,16 @@ PersistentTabRestoreService::PersistentTabRestoreService(
       delegate_(new Delegate(client_.get())),
       helper_(this, delegate_.get(), client_.get(), time_factory) {
   delegate_->set_tab_restore_service_helper(&helper_);
+  base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
+      &helper_,
+      "PersistentTabRestoreService",
+      base::ThreadTaskRunnerHandle::Get());
 }
 
-PersistentTabRestoreService::~PersistentTabRestoreService() {}
+PersistentTabRestoreService::~PersistentTabRestoreService() {
+  base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
+      &helper_);
+}
 
 void PersistentTabRestoreService::AddObserver(
     TabRestoreServiceObserver* observer) {