Communicate whether passive event listeners exist to cc.

cc/input/event_listener_properties.h

Index: cc/input/event_listener_properties.h
diff --git a/cc/input/event_listener_properties.h b/cc/input/event_listener_properties.h
new file mode 100644
index 0000000000000000000000000000000000000000..543254e62ae7f0d3399d0af6d21c29eee6be3b14
--- /dev/null
+++ b/cc/input/event_listener_properties.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 CC_INPUT_EVENT_LISTENER_PROPERTIES_H_
+#define CC_INPUT_EVENT_LISTENER_PROPERTIES_H_
+
+namespace cc {
+
+enum class EventListenerClass { kTouch, kMouseWheel, kNumClasses };
+
+struct EventListenerProperties {
+  enum : uint32_t { kNone = 0 };
+  enum : uint32_t { kBlocking = 1 << 0 };
+  enum : uint32_t { kPassive = 1 << 1 };
+  enum : uint32_t { kMax = kPassive | kBlocking };
+};
+
+}  // namespace cc
+
+#endif  // CC_INPUT_EVENT_LISTENER_PROPERTIES_H_