Add explicit TimeDelta constexpr copy constructor.

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index be0eb20f88a4df500d5dfe289fc0d35fed6acd64..17979f598b779a561554e5bb826e06c8f27677d2 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -242,6 +242,9 @@ class BASE_EXPORT TimeDelta {
     return delta_ >= other.delta_;
   }
 
+  // This works around crbug.com/635974
+  constexpr TimeDelta(const TimeDelta& other) : delta_(other.delta_) {}

[miu, 2016/08/11 21:48:56]

Since the bug is Windows-specific, please surround this new ctor with:

  #if defined(OS_WIN)
  ...
  #endif  // defined(OS_WIN)

[liberato (no reviews please), 2016/08/11 22:10:35]

Done.

+
  private:
   friend int64_t time_internal::SaturatedAdd(TimeDelta delta, int64_t value);
   friend int64_t time_internal::SaturatedSub(TimeDelta delta, int64_t value);