Communicate whether passive event listeners exist to cc.

cc/layers/event_listener_properties.h

Index: cc/layers/event_listener_properties.h
diff --git a/cc/layers/event_listener_properties.h b/cc/layers/event_listener_properties.h
new file mode 100644
index 0000000000000000000000000000000000000000..a80a180b847c2bf980e352370229f12ea7482ea1
--- /dev/null
+++ b/cc/layers/event_listener_properties.h
@@ -0,0 +1,41 @@
+// Copyright 2015 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 CC_LAYERS_EVENT_LISTENER_PROPERTIES_H_
+#define CC_LAYERS_EVENT_LISTENER_PROPERTIES_H_
+
+namespace cc {
+
+enum class EventListenerProperties : uint8_t {
+  NONE = 0x0,
+  BLOCKING = 0x1,
+  PASSIVE = 0x2,
+  MAX = PASSIVE | BLOCKING
+};
+
+inline EventListenerProperties operator&(EventListenerProperties a,
+                                         EventListenerProperties b) {
+  return EventListenerProperties(static_cast<uint8_t>(a) &
+                                 static_cast<uint8_t>(b));
+}
+
+inline EventListenerProperties& operator&=(EventListenerProperties& a,
+                                           EventListenerProperties b) {
+  return a = a & b;
+}
+
+inline EventListenerProperties operator|(EventListenerProperties a,
+                                         EventListenerProperties b) {
+  return EventListenerProperties(static_cast<uint8_t>(a) |
+                                 static_cast<uint8_t>(b));
+}
+
+inline EventListenerProperties& operator|=(EventListenerProperties& a,
+                                           EventListenerProperties b) {
+  return a = a | b;
+}
+
+}  // namespace cc
+
+#endif  // CC_LAYERS_EVENT_LISTENER_PROPERTIES_H_