Add ExternalTimerEventScope to log non internal timer events scopes

src/log.h

 // Copyright 2012 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_LOG_H_
 #define V8_LOG_H_
 
 #include <string>
 
 #include "src/allocation.h"
@@ skipping 307 matching lines @@
     static const char* v8_compile_full_code;
     static const char* v8_execute;
     static const char* v8_external;
     static const char* v8_ic_miss;
 
    private:
     Isolate* isolate_;
     const char* name_;
   };
 
+  class ExternalTimerEventScope {
+   public:
+    ExternalTimerEventScope(Isolate* isolate, const char* name)
+        : isolate_(isolate), name_(name) {
+      LogTimerEvent(START);
+    }
+
+    ~ExternalTimerEventScope() {
+      LogTimerEvent(END);
+    }
+
+    void LogTimerEvent(StartEnd se);
+
+   private:
+    Isolate* isolate_;
+    const char* name_;
+  };
+
   // ==== Events logged by --log-regexp ====
   // Regexp compilation and execution events.
 
   void RegExpCompileEvent(Handle<JSRegExp> regexp, bool in_cache);
 
   bool is_logging() {
     return is_logging_;
   }
 
   bool is_logging_code_events() {
@@ skipping 182 matching lines @@
                                  int length) = 0;
 
   NameBuffer* name_buffer_;
 };
 
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_