AllocationProfiler: introduce allocation_profiler flag in V8 api.

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1114 matching lines @@
   int id() const { return static_cast<int>(id_); }
 
   HStatistics* GetHStatistics();
   HTracer* GetHTracer();
 
   FunctionEntryHook function_entry_hook() { return function_entry_hook_; }
   void set_function_entry_hook(FunctionEntryHook function_entry_hook) {
     function_entry_hook_ = function_entry_hook;
   }
 
+  bool enable_allocation_profiler() {
+    ASSERT(!IsInitialized() || !initialized_from_snapshot());
+    // Fallback for release version.
+    if (IsInitialized() && initialized_from_snapshot())
+      return false;
+    allocation_profiler_ = true;
+    return true;
+  }
+
+  bool is_allocation_profiler_enabled() const {
+    return allocation_profiler_ || FLAG_enable_allocation_profiler;
+  }
+
   void* stress_deopt_count_address() { return &stress_deopt_count_; }
 
   inline RandomNumberGenerator* random_number_generator();
 
   // Given an address occupied by a live code object, return that object.
   Object* FindCodeObject(Address a);
 
  private:
   Isolate();
 
@@ skipping 221 matching lines @@
   ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
   DeferredHandles* deferred_handles_head_;
   OptimizingCompilerThread* optimizing_compiler_thread_;
   SweeperThread** sweeper_thread_;
 
   // Counts deopt points if deopt_every_n_times is enabled.
   unsigned int stress_deopt_count_;
+  bool allocation_profiler_;
 
   friend class ExecutionAccess;
   friend class HandleScopeImplementer;
   friend class IsolateInitializer;
   friend class OptimizingCompilerThread;
   friend class SweeperThread;
   friend class ThreadManager;
   friend class Simulator;
   friend class StackGuard;
   friend class ThreadId;
@@ skipping 118 matching lines @@
 
 // Mark the native context with out of memory.
 inline void Context::mark_out_of_memory() {
   native_context()->set_out_of_memory(GetIsolate()->heap()->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_