Removing the use of base::Time inside the LayerTreeHost system.

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index 40566b92317a3c94ff183994a22c0029122fceb0..83781c5b4e5d0c25ae1b122bfb1deb6dbb02fa13 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -47,6 +47,7 @@
 #endif
 
 #include <limits>
+#include <ostream>
 
 namespace base {
 
@@ -613,6 +614,14 @@ class BASE_EXPORT TimeTicks {
   // application runs.
   static TimeTicks UnixEpoch();
 
+  // Converts time to/from a double which is the number of seconds since epoch
+  // (Jan 1, 1970).  Webkit uses this format to represent time.

[jamesr, 2014/02/28 00:58:16]

if this is just needed for interacting with Blink (we don't use WebKit any more)
then it doesn't belong in base/, it should probably go somewhere in the
chromium-blink integration code that's currently split between content/ and
webkit/

+  // Because WebKit initializes double time value to 0 to indicate "not
+  // initialized", we map it to empty Time object that also means "not
+  // initialized".
+  static TimeTicks FromWebKit(double dt);
+  double ToWebKit() const;
+
   // Returns the internal numeric value of the TimeTicks object.
   // For serializing, use FromInternalValue to reconstitute.
   int64 ToInternalValue() const {
@@ -688,6 +697,21 @@ inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
   return TimeTicks(t.ticks_ + delta_);
 }
 
+inline ::std::ostream& operator<<(::std::ostream& os, const TimeTicks& t) {
+  os << "TimeTicks(";

[jamesr, 2014/02/28 00:58:16]

i'm pretty sure we don't want to have these stream operator based functions
defined in every single translation unit that #includes base/time.h - they're
probably huge.

+  int64 ticks = t.ToInternalValue();
+  if (ticks == 0)
+    ;
+  else if (ticks == std::numeric_limits<int64>::max())
+    os << "max";
+  else if (ticks == std::numeric_limits<int64>::min())
+    os << "min";
+  else
+    os << ticks;
+  os << ")";
+  return os;
+}
+
 }  // namespace base
 
 #endif  // BASE_TIME_TIME_H_