Wire up profiling budget to the Code object.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 040664dc06641f4df917320456564869c86e8242..dc1cb20d767ce108c7c14b3fe30475f9d99879b9 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4872,6 +4872,11 @@ class Code: public HeapObject {
   // it is only used by the garbage collector itself.
   DECL_ACCESSORS(gc_metadata, Object)
 
+  // Profiling budget counter to govern when to invoke the runtime profiler.
+  DECL_ACCESSORS(profiling_budget, Cell)
+
+  inline void ResetProfilingBudget(int value);
+
   // [ic_age]: Inline caching age: the value of the Heap::global_ic_age
   // at the moment when this object was created.
   inline void set_ic_age(int count);
@@ -5185,8 +5190,8 @@ class Code: public HeapObject {
   static const int kTypeFeedbackInfoOffset =
       kDeoptimizationDataOffset + kPointerSize;
   static const int kGCMetadataOffset = kTypeFeedbackInfoOffset + kPointerSize;
-  static const int kICAgeOffset =
-      kGCMetadataOffset + kPointerSize;
+  static const int kProfilingBudgetOffset = kGCMetadataOffset + kPointerSize;
+  static const int kICAgeOffset = kProfilingBudgetOffset + kPointerSize;
   static const int kFlagsOffset = kICAgeOffset + kIntSize;
   static const int kKindSpecificFlags1Offset = kFlagsOffset + kIntSize;
   static const int kKindSpecificFlags2Offset =