Track plugin input event latency

ppapi/cpp/private/input_event_private.cc

Index: ppapi/cpp/private/input_event_private.cc
diff --git a/ppapi/cpp/private/input_event_private.cc b/ppapi/cpp/private/input_event_private.cc
new file mode 100644
index 0000000000000000000000000000000000000000..466894c7fbbeb2d004df5c1ad431667214a904d7
--- /dev/null
+++ b/ppapi/cpp/private/input_event_private.cc
@@ -0,0 +1,44 @@
+// Copyright (c) 2014 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.
+
+#include "ppapi/cpp/private/input_event_private.h"
+
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_InputEvent_Private>() {
+  return PPB_INPUTEVENT_PRIVATE_INTERFACE;
+}
+
+}  // namespace
+
+InputEventPrivate::InputEventPrivate() : InputEvent() {
+}
+
+InputEventPrivate::InputEventPrivate(const InputEvent& event) : InputEvent() {
+  if (!has_interface<PPB_InputEvent_Private_0_1>())
+    return;
+  Module::Get()->core()->AddRefResource(event.pp_resource());
+  PassRefFromConstructor(event.pp_resource());
+}
+
+bool InputEventPrivate::TraceInputLatency(bool has_damage) {
+  if (!has_interface<PPB_InputEvent_Private_0_1>())
+    return false;
+  return PP_ToBool(
+      get_interface<PPB_InputEvent_Private_0_1>()->TraceInputLatency(
+          pp_resource(), PP_FromBool(has_damage)));
+}
+
+void InputEventPrivate::StartTrackingLatency(const InstanceHandle& instance) {
+  if (!has_interface<PPB_InputEvent_Private>())
+    return;
+  return get_interface<PPB_InputEvent_Private>()->StartTrackingLatency(
+      instance.pp_instance());
+}
+
+}  // namespace pp