[WIP] A sampler thread in d8 for consuming the new API.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index 1b32fded6c980fbc6c6ecf14ea2f310e22950409..b5b694046b259b5e3ea966111d11ed36a9fc209a 100644
--- a/src/log.h
+++ b/src/log.h
@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "include/v8-sampler.h"
+
 #include "src/allocation.h"
 #include "src/base/platform/elapsed-timer.h"
 #include "src/base/platform/platform.h"
@@ -149,6 +151,19 @@ class LowLevelLogger;
 class PerfJitLogger;
 class Sampler;
 
+class StubCodeEventHandler: public v8::CodeEventHandler {
+ public:
+  void Create(const void* from,
+              const int size,
+              const std::string& name) {}
+  void Delete(const void* from) {}
+  void Move(const void* from, const void* to) {}
+  void SharedLibrary(const std::string& library_path,
+                     const void* start,
+                     const void* end) {}
+};
+
+
 class Logger {
  public:
 #define DECLARE_ENUM(enum_item, ignore) enum_item,
@@ -165,7 +180,10 @@ class Logger {
   void SetCodeEventHandler(uint32_t options,
                            JitCodeEventHandler event_handler);
 
+  void SetCodeEventHandler(v8::CodeEventHandler* handler);
+
   Sampler* sampler();
+  v8::CodeEventHandler* codeEventHandler();
 
   // Frees resources acquired in SetUp.
   // When a temporary file is used for the log, returns its stream descriptor,
@@ -435,6 +453,7 @@ class Logger {
   LowLevelLogger* ll_logger_;
   JitLogger* jit_logger_;
   List<CodeEventListener*> listeners_;
+  CodeEventHandler* code_event_handler_;
 
   // Guards against multiple calls to TearDown() that can happen in some tests.
   // 'true' between SetUp() and TearDown().