Notify Files App when ARC++ app is installed/removed

components/arc/intent_helper/arc_intent_helper_observer.h

Index: components/arc/intent_helper/arc_intent_helper_observer.h
diff --git a/components/arc/intent_helper/arc_intent_helper_observer.h b/components/arc/intent_helper/arc_intent_helper_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..d8cc87e7d65c95973ec0c53c029b2a0648af770a
--- /dev/null
+++ b/components/arc/intent_helper/arc_intent_helper_observer.h
@@ -0,0 +1,21 @@
+// 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_ARC_INTENT_HELPER_ARC_INTENT_HELPER_OBSERVER_H_
+#define COMPONENTS_ARC_INTENT_HELPER_ARC_INTENT_HELPER_OBSERVER_H_
+
+namespace arc {
+
+class ArcIntentHelperObserver {
+ public:
+  // Called when app's intent filter is updated.
+  virtual void OnAppsUpdated() = 0;
+
+ protected:
+  virtual ~ArcIntentHelperObserver() = default;
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_INTENT_HELPER_ARC_INTENT_HELPER_OBSERVER_H_