Update from https://crrev.com/317530

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index 18de085e341714b85efe6e10a988835601bf998e..6d618614aef3ed7574f3f279c37805356d935067 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -178,6 +178,14 @@ class BASE_EXPORT TimeDelta {
     return delta_ / a.delta_;
   }
 
+  // Multiplicative computations with floats.
+  TimeDelta multiply_by(double a) const {
+    return TimeDelta(delta_ * a);
+  }
+  TimeDelta divide_by(double a) const {
+    return TimeDelta(delta_ / a);
+  }
+
   // Defined below because it depends on the definition of the other classes.
   Time operator+(Time t) const;
   TimeTicks operator+(TimeTicks t) const;