[Android] Add animation frame time histogram class.

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index 18de085e341714b85efe6e10a988835601bf998e..0cb729aaceb20e46ed9b4f27c687e3bb825fe0bf 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -75,6 +75,7 @@ class BASE_EXPORT TimeDelta {
   static TimeDelta FromSecondsD(double secs);
   static TimeDelta FromMillisecondsD(double ms);
   static TimeDelta FromMicroseconds(int64 us);
+  static TimeDelta FromNanoseconds(int64 ns);
 #if defined(OS_WIN)
   static TimeDelta FromQPCValue(LONGLONG qpc_value);
 #endif
@@ -575,6 +576,14 @@ inline TimeDelta TimeDelta::FromMicroseconds(int64 us) {
   return TimeDelta(us);
 }
 
+// static
+inline TimeDelta TimeDelta::FromNanoseconds(int64 ns) {
+  // Preserve max to prevent overflow.
+  if (ns == std::numeric_limits<int64>::max())
+    return Max();
+  return TimeDelta(ns / Time::kNanosecondsPerMicrosecond);
+}
+
 inline Time TimeDelta::operator+(Time t) const {
   return Time(t.us_ + delta_);
 }