Use a monotonic clock (TimeTicks) to report network times to WebCore.

base/time.h

Index: base/time.h
diff --git a/base/time.h b/base/time.h
index aa97f0ab4f422c807247e5c226b565fff21ac6c8..95ecd1c46ea87590cfd4039743137433280b181d 100644
--- a/base/time.h
+++ b/base/time.h
@@ -492,6 +492,13 @@ class BASE_EXPORT TimeTicks {
     return ticks_;
   }
 
+  // Converts an integer value representing TimeTicks to a class. This is used
+  // when deserializing a |TimeTicks| structure, using a value that originated
+  // from |TimeTicks::ToInternalValue()|.
+  static TimeTicks FromInternalValue(int64 ticks) {
+    return TimeTicks(ticks);
+  }

[wtc, 2011/08/26 21:55:41]

It is safe to deserialize this way only if all the int64
ticks values have the same "origin" (time 0), which is
probably true only if they come from the same process.

Also, this static method is equivalent to the protected
constructor on lines 555-556 below.  Why don't you just
make that constructor public?

[James Simonsen, 2011/08/26 22:34:29]

Pavel and I discussed this earlier. All of the platforms use a system-wide clock
for TimeTicks. So, all processes use the same origin (roughly time since last
reboot).
I copied it from Time. I've now copied the comment that went with that one too.
I don't have an opinion either way though, so if you'd like TimeTicks to have a
different interface than Time, let me know.

[wtc, 2011/08/26 23:39:15]

If you are relying on this fact, and are deserializing
TimeTicks values that come from different processes,
you need to document this property in the class TimeTicks.
I see.  What you have is fine.

+
   TimeTicks& operator=(TimeTicks other) {
     ticks_ = other.ticks_;
     return *this;