Fix PPAPI time conversion code to handle epoch times.

webkit/plugins/ppapi/time_conversion_unittest.cc

-// Copyright (c) 2012 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 <math.h>
-#include <stdlib.h>
-
-#include "ppapi/shared_impl/time_conversion.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace ppapi {
-
-// Slop we'll allow in two Time "internal values" to consider them equal.
-// Double conversion can introduce rounding errors. The internal values are in
-// microseconds, so an error here is very small.
-static const int kTimeInternalValueSlop = 2;
-
-// Same as above in double-precision seconds units.
-static const double kTimeSecondsSlop =
-    static_cast<double>(kTimeInternalValueSlop) /
-    base::Time::kMicrosecondsPerSecond;
-
-TEST(TimeConversion, Time) {
-  // Should be able to round-trip.
-  base::Time now = base::Time::Now();
-  base::Time converted = ppapi::PPTimeToTime(TimeToPPTime(now));
-  EXPECT_GE(kTimeInternalValueSlop,
-            abs(static_cast<int>((converted - now).ToInternalValue())));
-
-  // Units should be in seconds.
-  base::Time one_second_from_now = now + base::TimeDelta::FromSeconds(1);
-  double converted_one_second_from_now =
-      ppapi::TimeToPPTime(one_second_from_now) - ppapi::TimeToPPTime(now);
-  EXPECT_GE(kTimeSecondsSlop, fabs(converted_one_second_from_now - 1));
-}
-
-TEST(TimeConversion, EventTime) {
-  // Should be able to round-trip.
-  base::Time now = base::Time::Now();
-  double event_now = now.ToDoubleT();
-  double converted =
-      ppapi::EventTimeToPPTimeTicks(ppapi::PPTimeTicksToEventTime(event_now));
-  EXPECT_GE(kTimeSecondsSlop, fabs(converted - event_now));
-
-  // Units should be in seconds.
-  base::Time one_second_from_now = now + base::TimeDelta::FromSeconds(1);
-  double event_one_second_from_now = one_second_from_now.ToDoubleT();
-  EXPECT_GE(kTimeSecondsSlop,
-            1.0 - ppapi::EventTimeToPPTimeTicks(event_one_second_from_now) -
-                ppapi::EventTimeToPPTimeTicks(event_now));
-}
-
-}  // namespace ppapi