Update base/timer.h code to pass through Location from call sites.

base/timer.h

Index: base/timer.h
diff --git a/base/timer.h b/base/timer.h
index 2e21582a9a0ab8404bc981c6db2f120f6f31ed6b..30cb10900d8216f4e79fbe5b640c9a39bc171e66 100644
--- a/base/timer.h
+++ b/base/timer.h
@@ -87,9 +87,14 @@ class BASE_EXPORT BaseTimer_Helper {
   // We have access to the timer_ member so we can orphan this task.
   class TimerTask : public Task {
    public:
-    explicit TimerTask(TimeDelta delay) : timer_(NULL), delay_(delay) {
+    TimerTask(const tracked_objects::Location& posted_from,
+              TimeDelta delay)
+        : posted_from_(posted_from),
+          timer_(NULL),
+          delay_(delay) {
     }
     virtual ~TimerTask() {}
+    tracked_objects::Location posted_from_;
     BaseTimer_Helper* timer_;
     TimeDelta delay_;
   };
@@ -116,9 +121,12 @@ class BaseTimer : public BaseTimer_Helper {
 
   // Call this method to start the timer.  It is an error to call this method
   // while the timer is already running.
-  void Start(TimeDelta delay, Receiver* receiver, ReceiverMethod method) {
+  void Start(const tracked_objects::Location& posted_from,
+             TimeDelta delay,
+             Receiver* receiver,
+             ReceiverMethod method) {
     DCHECK(!IsRunning());
-    InitiateDelayedTask(new TimerTask(delay, receiver, method));
+    InitiateDelayedTask(new TimerTask(posted_from, delay, receiver, method));
   }
 
   // Call this method to stop the timer.  It is a no-op if the timer is not
@@ -138,8 +146,11 @@ class BaseTimer : public BaseTimer_Helper {
 
   class TimerTask : public BaseTimer_Helper::TimerTask {
    public:
-    TimerTask(TimeDelta delay, Receiver* receiver, ReceiverMethod method)
-        : BaseTimer_Helper::TimerTask(delay),
+    TimerTask(const tracked_objects::Location& posted_from,
+              TimeDelta delay,
+              Receiver* receiver,
+              ReceiverMethod method)
+        : BaseTimer_Helper::TimerTask(posted_from, delay),
           receiver_(receiver),
           method_(method) {
     }
@@ -162,7 +173,7 @@ class BaseTimer : public BaseTimer_Helper {
     }
 
     TimerTask* Clone() const {
-      return new TimerTask(delay_, receiver_, method_);
+      return new TimerTask(posted_from_, delay_, receiver_, method_);
     }
 
    private:
@@ -221,8 +232,12 @@ class DelayTimer {
  public:
   typedef void (Receiver::*ReceiverMethod)();
 
-  DelayTimer(TimeDelta delay, Receiver* receiver, ReceiverMethod method)
-      : receiver_(receiver),
+  DelayTimer(const tracked_objects::Location& posted_from,
+             TimeDelta delay,
+             Receiver* receiver,
+             ReceiverMethod method)
+      : posted_from_(posted_from),
+        receiver_(receiver),
         method_(method),
         delay_(delay) {
   }
@@ -242,7 +257,7 @@ class DelayTimer {
 
     // The timer isn't running, or will expire too late, so restart it.
     timer_.Stop();
-    timer_.Start(delay, this, &DelayTimer<Receiver>::Check);
+    timer_.Start(posted_from_, delay, this, &DelayTimer<Receiver>::Check);
   }
 
   void Check() {
@@ -259,6 +274,7 @@ class DelayTimer {
     (receiver_->*method_)();
   }
 
+  tracked_objects::Location posted_from_;
   Receiver *const receiver_;
   const ReceiverMethod method_;
   const TimeDelta delay_;