Make cc::Animation::TrimTimeToCurrentIteration and

cc::AnimationCurve::Duration use TimeTicks/TimeDelta to represent time.

This patch adds a new file time_util.h which adds new class TimeUtil.
This TimeUtil class holds helper functions to operate on TimeDelta
in double because base::TimeDelta class doesnot allow
multiply/divide operations in double.

Review URL: https://codereview.chromium.org/693883004

Cr-Commit-Position: refs/heads/master@{#303790}

1 files changed, 30 insertions, 0 deletions

diff --git a/cc/base/time_util.h b/cc/base/time_util.h
new file mode 100644
index 0000000..dc07e74
--- /dev/null
+++ b/cc/base/time_util.h
@@ -0,0 +1,30 @@
+// Copyright 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.
+
+#ifndef CC_BASE_TIME_UTIL_H_
+#define CC_BASE_TIME_UTIL_H_
+
+namespace base {
+class TimeDelta;
+}
+
+namespace cc {
+
+class CC_EXPORT TimeUtil {
+ public:
+  static base::TimeDelta Scale(base::TimeDelta time_delta, double value) {
+    return base::TimeDelta::FromInternalValue(static_cast<int64>(
+        static_cast<double>(time_delta.ToInternalValue()) * value));
+  }
+
+  static base::TimeDelta Mod(base::TimeDelta dividend,
+                             base::TimeDelta divisor) {
+    return base::TimeDelta::FromInternalValue(dividend.ToInternalValue() %
+                                              divisor.ToInternalValue());
+  }
+};
+
+}  // namespace cc
+
+#endif  // CC_BASE_TIME_UTIL_H_