[profiler] Move away from UnboundedQueue to LockedQueue for regular events.

src/atomic-utils.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ATOMIC_UTILS_H_
 #define V8_ATOMIC_UTILS_H_
 
 #include <limits.h>
 
 #include "src/base/atomicops.h"
 #include "src/base/macros.h"
 
 namespace v8 {
 namespace internal {
 
 template <class T>
 class AtomicNumber {
  public:
   AtomicNumber() : value_(0) {}
   explicit AtomicNumber(T initial) : value_(initial) {}
 
-  V8_INLINE void Increment(T increment) {
-    base::Barrier_AtomicIncrement(&value_,
-                                  static_cast<base::AtomicWord>(increment));
+  // Returns the newly set value.
+  V8_INLINE T Increment(T increment) {
+    return static_cast<T>(base::Barrier_AtomicIncrement(
+        &value_, static_cast<base::AtomicWord>(increment)));
   }
 
   V8_INLINE T Value() { return static_cast<T>(base::Acquire_Load(&value_)); }
 
   V8_INLINE void SetValue(T new_value) {
     base::Release_Store(&value_, static_cast<base::AtomicWord>(new_value));
   }
 
   V8_INLINE T operator=(T value) {
     SetValue(value);
@@ skipping 130 matching lines @@
     return static_cast<base::AtomicWord>(1) << element;
   }
 
   base::AtomicWord bits_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // #define V8_ATOMIC_UTILS_H_