Proof of concept for tr1-based Task replacement.

base/message_loop.cc

Index: base/message_loop.cc
diff --git a/base/message_loop.cc b/base/message_loop.cc
index 49d76a03bfed8c8ad9d8775b83fc4ecac67759fe..929127813338dd1aad0d0bdb84d0015f7101f610 100644
--- a/base/message_loop.cc
+++ b/base/message_loop.cc
@@ -306,6 +306,32 @@ void MessageLoop::QuitNow() {
   }
 }
 
+// This is a complete hack just for the proof of concept.  Really, we want
+// to modify PendingTask to understand base::Closure.
+class ClosureTaskAdapter : public Task {
+ public:
+  explicit ClosureTaskAdapter(const tracked_objects::Location& from_here,
+                              base::Closure c)
+      : closure_(c) {
+    closure_.tracked()->SetBirthPlace(from_here);
+  }
+
+  virtual void Run() {
+    closure_();
+  }
+
+ private:
+  base::Closure closure_;
+};
+
+void MessageLoop::PostClosure(
+    const tracked_objects::Location& from_here, base::Closure closure) {
+  // The wrapping of Closure in Task will screw up task tracking...that will be
+  // fixed if we correctly refactor message loop's PendingTask.
+  PostTask_Helper(from_here, new ClosureTaskAdapter(from_here, closure), 0,
+                  true);
+}
+
 void MessageLoop::PostTask(
     const tracked_objects::Location& from_here, Task* task) {
   PostTask_Helper(from_here, task, 0, true);
@@ -316,6 +342,15 @@ void MessageLoop::PostDelayedTask(
   PostTask_Helper(from_here, task, delay_ms, true);
 }
 
+void MessageLoop::PostDelayedClosure(
+    const tracked_objects::Location& from_here, base::Closure closure,
+    int64 delay_ms) {
+  // The wrapping of Closure in Task will screw up task tracking...that will be
+  // fixed if we correctly refactor message loop's PendingTask.
+  PostTask_Helper(from_here, new ClosureTaskAdapter(from_here, closure),
+                  delay_ms, true);
+}
+
 void MessageLoop::PostNonNestableTask(
     const tracked_objects::Location& from_here, Task* task) {
   PostTask_Helper(from_here, task, 0, false);