Very basic change to add a TriggerManager class owned by SafeBrowsingService.

components/safe_browsing/triggers/trigger_manager.h

Index: components/safe_browsing/triggers/trigger_manager.h
diff --git a/components/safe_browsing/triggers/trigger_manager.h b/components/safe_browsing/triggers/trigger_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..3d89fd7c40f76407d2305dbb788a5cf95caf25c7
--- /dev/null
+++ b/components/safe_browsing/triggers/trigger_manager.h
@@ -0,0 +1,27 @@
+// Copyright (c) 2017 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_SAFE_BROWSING_TRIGGERS_TRIGGER_MANAGER_H_
+#define COMPONENTS_SAFE_BROWSING_TRIGGERS_TRIGGER_MANAGER_H_
+
+#include "base/macros.h"
+
+namespace safe_browsing {
+
+// This class manager SafeBrowsing triggers. It has two main responsibilities:
+// 1) ensuring triggers only run when appropriate by honouring user opt-ins and
+// incognito state, and 2) tracking how often triggers fire and throttling them
+// when necessary.
+class TriggerManager {
+ public:
+  TriggerManager();
+  ~TriggerManager();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TriggerManager);
+};
+
+}  // namespace safe_browsing
+
+#endif  // COMPONENTS_SAFE_BROWSING_TRIGGERS_TRIGGER_MANAGER_H_