CC::Animations should use TimeTicks & TimeDelta to represent time

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index 546920b2e92cac257663e7256da8cfa662f803f2..12ac1f024699635b2eb68a10f0cbcfb4028adf16 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -665,6 +665,19 @@ class BASE_EXPORT TimeTicks {
     return ticks_;
   }
 
+  static double InSecondsF(TimeTicks time) {
+    if (time.ToInternalValue() == std::numeric_limits<int64>::max()) {
+      // Preserve max to prevent overflow.
+      return std::numeric_limits<int>::max();
+    }
+    return static_cast<double>(time.ToInternalValue()) /
+           Time::kMicrosecondsPerSecond;
+  }
+
+  static TimeTicks FromSeconds(double seconds) {
+    return TimeTicks::FromInternalValue(seconds * Time::kMicrosecondsPerSecond);
+  }

[ajuma, 2014/04/24 20:41:36]

It's not obvious to me whether these are a good idea (since TimeTicks seems to
go out of its way to avoid committing to the units that its internal value
represents). Since the rest of the CL relies heavily on this, I'd suggest
putting these up for review separately first.

+
   TimeTicks& operator=(TimeTicks other) {
     ticks_ = other.ticks_;
     return *this;