Fix JS ratio computation on startup.

src/runtime-profiler.h

Index: src/runtime-profiler.h
diff --git a/src/runtime-profiler.h b/src/runtime-profiler.h
index 8074035a92da02d37c4c8217db7f9275c508d98a..3656893ae783c556bf1215bba30c4ffc1c057f7d 100644
--- a/src/runtime-profiler.h
+++ b/src/runtime-profiler.h
@@ -40,13 +40,6 @@ class Object;
 class PendingListNode;
 class Semaphore;
 
-
-enum SamplerState {
-  IN_NON_JS_STATE = 0,
-  IN_JS_STATE = 1
-};
-
-
 class RuntimeProfiler {
  public:
   explicit RuntimeProfiler(Isolate* isolate);
@@ -101,6 +94,11 @@ class RuntimeProfiler {
   static const int kSamplerWindowSize = 16;
   static const int kStateWindowSize = 128;
 
+  enum SamplerState {
+    IN_NON_JS_STATE = 0,
+    IN_JS_STATE = 1
+  };
+
   static void HandleWakeUp(Isolate* isolate);
 
   void Optimize(JSFunction* function, bool eager, int delay);
@@ -137,6 +135,7 @@ class RuntimeProfiler {
 
   SamplerState state_window_[kStateWindowSize];
   int state_window_position_;
+  int state_window_ticks_;
   int state_counts_[2];
 
   // Possible state values: