Added support to convert double to timedelta's without loss of data during type conversion from dou…

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index 69a132431d6597514e44191a04db8bf461fb2c40..546920b2e92cac257663e7256da8cfa662f803f2 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -66,6 +66,8 @@ class BASE_EXPORT TimeDelta {
   static TimeDelta FromMinutes(int minutes);
   static TimeDelta FromSeconds(int64 secs);
   static TimeDelta FromMilliseconds(int64 ms);
+  static TimeDelta FromSecondsD(double secs);
+  static TimeDelta FromMillisecondsD(double ms);
   static TimeDelta FromMicroseconds(int64 us);
 #if defined(OS_WIN)
   static TimeDelta FromQPCValue(LONGLONG qpc_value);
@@ -543,6 +545,22 @@ inline TimeDelta TimeDelta::FromMilliseconds(int64 ms) {
 }
 
 // static
+inline TimeDelta TimeDelta::FromSecondsD(double secs) {
+  // Preserve max to prevent overflow.
+  if (secs == std::numeric_limits<double>::infinity())
+    return Max();
+  return TimeDelta(secs * Time::kMicrosecondsPerSecond);
+}
+
+// static
+inline TimeDelta TimeDelta::FromMillisecondsD(double ms) {
+  // Preserve max to prevent overflow.
+  if (ms == std::numeric_limits<double>::infinity())
+    return Max();
+  return TimeDelta(ms * Time::kMicrosecondsPerMillisecond);
+}
+
+// static
 inline TimeDelta TimeDelta::FromMicroseconds(int64 us) {
   // Preserve max to prevent overflow.
   if (us == std::numeric_limits<int64>::max())