Integrate Chrome tracing with V8 (WIP)

src/counters.h

Index: src/counters.h
diff --git a/src/counters.h b/src/counters.h
index 41107cfc33b8c944496e37d269c4ba647ad260fc..afd139575db04467bb25d0a262bdb51d2ad44f44 100644
--- a/src/counters.h
+++ b/src/counters.h
@@ -9,6 +9,7 @@
 #include "src/allocation.h"
 #include "src/base/platform/elapsed-timer.h"
 #include "src/globals.h"
+#include "src/log.h"
 #include "src/objects.h"
 
 namespace v8 {
@@ -224,12 +225,9 @@ class Histogram {
 class HistogramTimer : public Histogram {
  public:
   HistogramTimer() { }
-  HistogramTimer(const char* name,
-                 int min,
-                 int max,
-                 int num_buckets,
-                 Isolate* isolate)
-      : Histogram(name, min, max, num_buckets, isolate) {}
+  HistogramTimer(const char* name, int min, int max, int num_buckets,
+                 Isolate* isolate, Logger::Overhead overhead)
+      : Histogram(name, min, max, num_buckets, isolate), overhead_(overhead) {}
 
   // Start the timer.
   void Start();
@@ -242,6 +240,8 @@ class HistogramTimer : public Histogram {
     return Enabled() && timer_.IsStarted();
   }
 
+  Logger::Overhead overhead() { return overhead_; }
+
   // TODO(bmeurer): Remove this when HistogramTimerScope is fixed.
 #ifdef DEBUG
   base::ElapsedTimer* timer() { return &timer_; }
@@ -249,6 +249,7 @@ class HistogramTimer : public Histogram {
 
  private:
   base::ElapsedTimer timer_;
+  Logger::Overhead overhead_;
 };
 
 // Helper class for scoping a HistogramTimer.
@@ -297,25 +298,24 @@ class HistogramTimerScope BASE_EMBEDDED {
   HR(gc_idle_time_limit_overshot, V8.GCIdleTimeLimit.Overshot, 0, 10000, 101) \
   HR(gc_idle_time_limit_undershot, V8.GCIdleTimeLimit.Undershot, 0, 10000, 101)
 
-#define HISTOGRAM_TIMER_LIST(HT)                             \
-  /* Garbage collection timers. */                           \
-  HT(gc_compactor, V8.GCCompactor)                           \
-  HT(gc_scavenger, V8.GCScavenger)                           \
-  HT(gc_context, V8.GCContext) /* GC context cleanup time */ \
-  HT(gc_idle_notification, V8.GCIdleNotification)            \
-  HT(gc_incremental_marking, V8.GCIncrementalMarking)        \
-  HT(gc_low_memory_notification, V8.GCLowMemoryNotification) \
-  /* Parsing timers. */                                      \
-  HT(parse, V8.Parse)                                        \
-  HT(parse_lazy, V8.ParseLazy)                               \
-  HT(pre_parse, V8.PreParse)                                 \
-  /* Total compilation times. */                             \
-  HT(compile, V8.Compile)                                    \
-  HT(compile_eval, V8.CompileEval)                           \
-  /* Serialization as part of compilation (code caching) */  \
-  HT(compile_serialize, V8.CompileSerialize)                 \
-  HT(compile_deserialize, V8.CompileDeserialize)
-
+#define HISTOGRAM_TIMER_LIST(HT)                                     \
+  /* Garbage collection timers. */                                   \
+  HT(gc_compactor, V8.GCCompactor, LOW)                              \
+  HT(gc_scavenger, V8.GCScavenger, LOW)                              \
+  HT(gc_context, V8.GCContext, NORMAL) /* GC context cleanup time */ \
+  HT(gc_idle_notification, V8.GCIdleNotification, LOW)               \
+  HT(gc_incremental_marking, V8.GCIncrementalMarking, LOW)           \
+  HT(gc_low_memory_notification, V8.GCLowMemoryNotification, NORMAL) \
+  /* Parsing timers. */                                              \
+  HT(parse, V8.Parse, NORMAL)                                        \
+  HT(parse_lazy, V8.ParseLazy, NORMAL)                               \
+  HT(pre_parse, V8.PreParse, NORMAL)                                 \
+  /* Total compilation times. */                                     \
+  HT(compile, V8.Compile, NORMAL)                                    \
+  HT(compile_eval, V8.CompileEval, NORMAL)                           \
+  /* Serialization as part of compilation (code caching) */          \
+  HT(compile_serialize, V8.CompileSerialize, NORMAL)                 \
+  HT(compile_deserialize, V8.CompileDeserialize, NORMAL)
 
 #define HISTOGRAM_PERCENTAGE_LIST(HP)                                 \
   /* Heap fragmentation. */                                           \
@@ -562,7 +562,7 @@ class Counters {
   HISTOGRAM_RANGE_LIST(HR)
 #undef HR
 
-#define HT(name, caption) \
+#define HT(name, caption, overhead) \
   HistogramTimer* name() { return &name##_; }
   HISTOGRAM_TIMER_LIST(HT)
 #undef HT
@@ -614,7 +614,7 @@ class Counters {
 #undef SC
 
   enum Id {
-#define RATE_ID(name, caption) k_##name,
+#define RATE_ID(name, caption, overhead) k_##name,
     HISTOGRAM_TIMER_LIST(RATE_ID)
 #undef RATE_ID
 #define PERCENTAGE_ID(name, caption) k_##name,
@@ -653,7 +653,7 @@ class Counters {
   HISTOGRAM_RANGE_LIST(HR)
 #undef HR
 
-#define HT(name, caption) \
+#define HT(name, caption, overhead) \
   HistogramTimer name##_;
   HISTOGRAM_TIMER_LIST(HT)
 #undef HT