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..b480487cbab47cf90653d9f01531e29874c207dd 100644
--- a/base/time.h
+++ b/base/time.h
@@ -492,6 +492,14 @@ 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()|. It is not provided as a constructor
+  // because the integer type may be unclear from the perspective of a caller.
+  static TimeTicks FromInternalValue(int64 ticks) {
+    return TimeTicks(ticks);
+  }
+
   TimeTicks& operator=(TimeTicks other) {
     ticks_ = other.ticks_;
     return *this;