Trace PostTasks from post to run

base/debug/trace_event.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This header is designed to give you trace_event macros without specifying
 // how the events actually get collected and stored. If you need to expose trace
 // event to some other universe, you can copy-and-paste this file,
 // implement the TRACE_EVENT_API macros, and do any other necessary fixup for
 // the target platform. The end result is that multiple libraries can funnel
 // events through to a shared trace event collector.
@@ skipping 144 matching lines @@
 
 #include "base/atomicops.h"
 #include "base/debug/trace_event_impl.h"
 #include "build/build_config.h"
 
 // By default, const char* argument values are assumed to have long-lived scope
 // and will not be copied. Use this macro to force a const char* to be copied.
 #define TRACE_STR_COPY(str) \
     trace_event_internal::TraceStringWithCopy(str)
 
+// By default, uint64 ID argument values are not mangled with the Process ID in
+// TRACE_EVENT_ASYNC macros. Use this macro to force Process ID mangling.
+#define TRACE_ID_MANGLE(id) \
+    trace_event_internal::TraceID::ForceMangle(id)
+
 // Records a pair of begin and end events called "name" for the current
 // scope, with 0, 1 or 2 associated arguments. If the category is not
 // enabled, then this does nothing.
 // - category and name strings must have application lifetime (statics or
 //   literals). They may not include " chars.
 #define TRACE_EVENT0(category, name) \
     INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name)
 #define TRACE_EVENT1(category, name, arg1_name, arg1_val) \
     INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, arg1_name, arg1_val)
 #define TRACE_EVENT2(category, name, arg1_name, arg1_val, arg2_name, arg2_val) \
@@ skipping 456 matching lines @@
 const int kZeroNumArgs = 0;
 const int kNoThreshholdBeginId = -1;
 const long long kNoThresholdValue = 0;
 const unsigned long long kNoEventId = 0;
 
 // TraceID encapsulates an ID that can either be an integer or pointer. Pointers
 // are mangled with the Process ID so that they are unlikely to collide when the
 // same pointer is used on different processes.
 class TraceID {
  public:
+  class ForceMangle {
+    public:
+     explicit ForceMangle(unsigned long long id) : data_(id) {}
+     explicit ForceMangle(unsigned long id) : data_(id) {}
+     explicit ForceMangle(unsigned int id) : data_(id) {}
+     explicit ForceMangle(unsigned short id) : data_(id) {}
+     explicit ForceMangle(unsigned char id) : data_(id) {}
+     explicit ForceMangle(long long id) :
+         data_(static_cast<unsigned long long>(id)) {}
+     explicit ForceMangle(long id) :
+         data_(static_cast<unsigned long long>(id)) {}
+     explicit ForceMangle(int id) :
+         data_(static_cast<unsigned long long>(id)) {}
+     explicit ForceMangle(short id) :
+         data_(static_cast<unsigned long long>(id)) {}
+     explicit ForceMangle(signed char id) :
+         data_(static_cast<unsigned long long>(id)) {}
+
+     unsigned long long data() const { return data_; }
+
+    private:
+     unsigned long long data_;
+  };
+
   explicit TraceID(const void* id, unsigned char* flags) :
       data_(static_cast<unsigned long long>(
           reinterpret_cast<unsigned long>(id))) {
     *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
   }
+  explicit TraceID(ForceMangle id, unsigned char* flags) : data_(id.data()) {
+    *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
+  }
   explicit TraceID(unsigned long long id, unsigned char* flags) :
       data_(id) { (void)flags; }
   explicit TraceID(unsigned long id, unsigned char* flags) :
       data_(id) { (void)flags; }
   explicit TraceID(unsigned int id, unsigned char* flags) :
       data_(id) { (void)flags; }
   explicit TraceID(unsigned short id, unsigned char* flags) :
       data_(id) { (void)flags; }
   explicit TraceID(unsigned char id, unsigned char* flags) :
       data_(id) { (void)flags; }
@@ skipping 208 matching lines @@
     const char* name;
     int threshold_begin_id;
   };
   Data* p_data_;
   Data data_;
 };
 
 }  // namespace trace_event_internal
 
 #endif  // BASE_DEBUG_TRACE_EVENT_H_