Implement a new flow event API that allows binding flow events and regular events.

ppapi/shared_impl/ppb_trace_event_impl.cc

 // 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.
 
 #include "ppapi/shared_impl/ppb_trace_event_impl.h"
 
 #include "base/basictypes.h"
 #include "base/threading/platform_thread.h"
 #include "base/trace_event/trace_event.h"
 #include "ppapi/thunk/thunk.h"
@@ skipping 70 matching lines @@
           trace_event_internal::kNoId,
           thread_id,
           base::TraceTicks::FromInternalValue(timestamp),
           num_args,
           arg_names,
           arg_types,
       // This cast is necessary for LP64 systems, where uint64_t is defined as
       // an unsigned long int, but trace_event internals are hermetic and
       // accepts an |unsigned long long*|.  The pointer types are compatible but
       // the compiler throws an error without an explicit cast.
-      reinterpret_cast<const unsigned long long*>(arg_values),
-      NULL,
-      flags);
+          reinterpret_cast<const unsigned long long*>(arg_values),
+          nullptr,
+          flags);
 }
 
 // static
 int64_t TraceEventImpl::Now() {
   return base::TraceTicks::Now().ToInternalValue();
 }
 
 // static
 void TraceEventImpl::SetThreadName(const char* thread_name) {
   base::PlatformThread::SetName(thread_name);
@@ skipping 22 matching lines @@
 const PPB_Trace_Event_Dev_0_1* GetPPB_Trace_Event_Dev_0_1_Thunk() {
   return &g_ppb_trace_event_thunk_0_1;
 }
 
 const PPB_Trace_Event_Dev_0_2* GetPPB_Trace_Event_Dev_0_2_Thunk() {
   return &g_ppb_trace_event_thunk_0_2;
 }
 
 }  // namespace thunk
 }  // namespace ppapi