1 files changed, 49 insertions, 0 deletions
diff --git a/ppapi/shared_impl/time_conversion.cc b/ppapi/shared_impl/time_conversion.cc
new file mode 100644
index 0000000..53d7b99
--- /dev/null
+++ b/ppapi/shared_impl/time_conversion.cc
@@ -0,0 +1,49 @@
+// Copyright (c) 2011 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/shared_impl/time_conversion.h"
+
+namespace ppapi {
+
+namespace {
+
+// Since WebKit doesn't use ticks for event times, we have to compute what
+// the time ticks would be assuming the wall clock time doesn't change.
+//
+// This should only be used for WebKit times which we can't change the
+// definition of.
+double GetTimeToTimeTicksDeltaInSeconds() {
+  static double time_to_ticks_delta_seconds = 0.0;
+  if (time_to_ticks_delta_seconds == 0.0) {
+    double wall_clock = TimeToPPTime(base::Time::Now());
+    double ticks = TimeTicksToPPTimeTicks(base::TimeTicks::Now());
+    time_to_ticks_delta_seconds = ticks - wall_clock;
+  }
+  return time_to_ticks_delta_seconds;
+}
+
+}  // namespace
+
+PP_Time TimeToPPTime(base::Time t) {
+  return t.ToDoubleT();
+}
+
+base::Time PPTimeToTime(PP_Time t) {
+  return base::Time::FromDoubleT(t);
+}
+
+PP_TimeTicks TimeTicksToPPTimeTicks(base::TimeTicks t) {
+  return static_cast<double>(t.ToInternalValue()) /
+      base::Time::kMicrosecondsPerSecond;
+}
+
+PP_TimeTicks EventTimeToPPTimeTicks(double event_time) {
+  return event_time + GetTimeToTimeTicksDeltaInSeconds();
+}
+
+double PPTimeTicksToEventTime(PP_TimeTicks t) {
+  return t - GetTimeToTimeTicksDeltaInSeconds();
+}
+
+}  // namespace ppapi