Add base::TimeDelta::Max().

base/time/time.cc

Index: base/time/time.cc
diff --git a/base/time/time.cc b/base/time/time.cc
index 9f3c53d6695b1e8b4960dc4911c761dff3b7aa56..c277bbf41e0e8a0d93fe01fef43ab75e5214590a 100644
--- a/base/time/time.cc
+++ b/base/time/time.cc
@@ -17,40 +17,81 @@ namespace base {
 
 // TimeDelta ------------------------------------------------------------------
 
+// static
+TimeDelta TimeDelta::Max() {
+  return TimeDelta(std::numeric_limits<int64>::max());
+}
+
 int TimeDelta::InDays() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int>::max();
+  }
   return static_cast<int>(delta_ / Time::kMicrosecondsPerDay);
 }
 
 int TimeDelta::InHours() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int>::max();
+  }
   return static_cast<int>(delta_ / Time::kMicrosecondsPerHour);
 }
 
 int TimeDelta::InMinutes() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int>::max();
+  }
   return static_cast<int>(delta_ / Time::kMicrosecondsPerMinute);
 }
 
 double TimeDelta::InSecondsF() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<double>::infinity();
+  }
   return static_cast<double>(delta_) / Time::kMicrosecondsPerSecond;
 }
 
 int64 TimeDelta::InSeconds() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int64>::max();
+  }
   return delta_ / Time::kMicrosecondsPerSecond;
 }
 
 double TimeDelta::InMillisecondsF() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<double>::infinity();
+  }
   return static_cast<double>(delta_) / Time::kMicrosecondsPerMillisecond;
 }
 
 int64 TimeDelta::InMilliseconds() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int64>::max();
+  }
   return delta_ / Time::kMicrosecondsPerMillisecond;
 }
 
 int64 TimeDelta::InMillisecondsRoundedUp() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int64>::max();
+  }
   return (delta_ + Time::kMicrosecondsPerMillisecond - 1) /
       Time::kMicrosecondsPerMillisecond;
 }
 
 int64 TimeDelta::InMicroseconds() const {
+  if (is_max()) {
+    // Preserve max to prevent overflow.
+    return std::numeric_limits<int64>::max();
+  }
   return delta_;
 }