Create top-level separate targets for browser and child dlls

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 file defines the set of trace_event macros without specifying
 // how the events actually get collected and stored. If you need to expose trace
 // events to some other universe, you can copy-and-paste this file as well as
 // trace_event.h, modifying the macros contained there as necessary for the
 // target platform. The end result is that multiple libraries can funnel events
 // through to a shared trace event collector.
@@ skipping 770 matching lines @@
 
 // Defines atomic operations used internally by the tracing system.
 #define TRACE_EVENT_API_ATOMIC_WORD base::subtle::AtomicWord
 #define TRACE_EVENT_API_ATOMIC_LOAD(var) base::subtle::NoBarrier_Load(&(var))
 #define TRACE_EVENT_API_ATOMIC_STORE(var, value) \
     base::subtle::NoBarrier_Store(&(var), (value))
 
 // Defines visibility for classes in trace_event.h
 #define TRACE_EVENT_API_CLASS_EXPORT BASE_EXPORT
 
-// Not supported in split-dll build. http://crbug.com/256965
-#if !defined(CHROME_SPLIT_DLL)
 // The thread buckets for the sampling profiler.
 TRACE_EVENT_API_CLASS_EXPORT extern \
     TRACE_EVENT_API_ATOMIC_WORD g_trace_state[3];
 
 #define TRACE_EVENT_API_THREAD_BUCKET(thread_bucket)                           \
     g_trace_state[thread_bucket]
 
-#endif
-
 ////////////////////////////////////////////////////////////////////////////////
 
 // Implementation detail: trace event macros create temporary variables
 // to keep instrumentation overhead low. These macros give each temporary
 // variable a unique name based on the line number to prevent name collissions.
 #define INTERNAL_TRACE_EVENT_UID3(a,b) \
     trace_event_unique_##a##b
 #define INTERNAL_TRACE_EVENT_UID2(a,b) \
     INTERNAL_TRACE_EVENT_UID3(a,b)
 #define INTERNAL_TRACE_EVENT_UID(name_prefix) \
@@ skipping 670 matching lines @@
   TraceEventSamplingStateScope(const char* category_and_name) {
     previous_state_ = TraceEventSamplingStateScope<BucketNumber>::Current();
     TraceEventSamplingStateScope<BucketNumber>::Set(category_and_name);
   }
 
   ~TraceEventSamplingStateScope() {
     TraceEventSamplingStateScope<BucketNumber>::Set(previous_state_);
   }
 
   static inline const char* Current() {
-// Not supported in split-dll build. http://crbug.com/256965
-#if !defined(CHROME_SPLIT_DLL)
     return reinterpret_cast<const char*>(TRACE_EVENT_API_ATOMIC_LOAD(
       g_trace_state[BucketNumber]));
-#else
-    return NULL;
-#endif
   }
 
   static inline void Set(const char* category_and_name) {
-// Not supported in split-dll build. http://crbug.com/256965
-#if !defined(CHROME_SPLIT_DLL)
     TRACE_EVENT_API_ATOMIC_STORE(
       g_trace_state[BucketNumber],
       reinterpret_cast<TRACE_EVENT_API_ATOMIC_WORD>(
         const_cast<char*>(category_and_name)));
-#endif
   }
 
  private:
   const char* previous_state_;
 };
 
 }  // namespace trace_event_internal
 
 namespace base {
 namespace debug {
@@ skipping 21 matching lines @@
   const char* name_;
   IDType id_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceScopedTrackableObject);
 };
 
 } // namespace debug
 } // namespace base
 
 #endif /* BASE_DEBUG_TRACE_EVENT_H_ */