Implements a new API to set a function entry hook for profiling.

src/v8.cc

Index: src/v8.cc
diff --git a/src/v8.cc b/src/v8.cc
index 2910a0700d92223521dddf8a072fc65fb6fa9615..4bfdbfce2c2d389d177a7906d1bc607c0275febf 100644
--- a/src/v8.cc
+++ b/src/v8.cc
@@ -60,6 +60,8 @@ static LazyMutex entropy_mutex = LAZY_MUTEX_INITIALIZER;
 
 static EntropySource entropy_source;
 
+static uintptr_t profiler_entry_hook = 0;
+
 
 bool V8::Initialize(Deserializer* des) {
   FlagList::EnforceFlagImplications();
@@ -164,6 +166,16 @@ void V8::SetReturnAddressLocationResolver(
 }
 
 
+void V8::SetFunctionEntryHook(uintptr_t entry_hook) {
+  profiler_entry_hook = entry_hook;  
+}
+
+
+uintptr_t V8::GetFunctionEntryHook() {
+  return profiler_entry_hook;
+}
+
+
 // Used by JavaScript APIs
 uint32_t V8::Random(Context* context) {
   ASSERT(context->IsGlobalContext());