Implement sampling profiler (chromium side change)

base/debug/trace_event.h

Index: base/debug/trace_event.h
diff --git a/base/debug/trace_event.h b/base/debug/trace_event.h
index 18feb33f3d0754897156a84c5027a7a64e9441dc..8fdeace61a096550fe27c5a6a9cdbe442f1570e5 100644
--- a/base/debug/trace_event.h
+++ b/base/debug/trace_event.h
@@ -725,12 +725,18 @@
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_DELETE_OBJECT, \
         category_group, name, TRACE_ID_DONT_MANGLE(id), TRACE_EVENT_FLAG_NONE)
 
+#define TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE( \

[Xianzhu, 2013/12/19 01:01:05]

Nit: I think this macro should be prefixed with INTERNAL_ because it is not
usable from outside. As it is internal, we can omit the parameter as the name
|category_group_enabled| is an internal hardcoded name (declared in
INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO).

[haraken, 2013/12/19 01:34:02]

Done.

+    category_group_enabled) \
+    *INTERNAL_TRACE_EVENT_UID(category_group_enabled) & \
+        (base::debug::TraceLog::ENABLED_FOR_RECORDING | \
+         base::debug::TraceLog::ENABLED_FOR_EVENT_CALLBACK)
 
 // Macro to efficiently determine if a given category group is enabled.
 #define TRACE_EVENT_CATEGORY_GROUP_ENABLED(category_group, ret) \
     do { \
       INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-      if (*INTERNAL_TRACE_EVENT_UID(category_group_enabled)) { \
+      if (TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE( \
+          category_group_enabled)) { \
         *ret = true; \
       } else { \
         *ret = false; \
@@ -870,7 +876,8 @@ TRACE_EVENT_API_CLASS_EXPORT extern \
 #define INTERNAL_TRACE_EVENT_ADD(phase, category_group, name, flags, ...) \
     do { \
       INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-      if (*INTERNAL_TRACE_EVENT_UID(category_group_enabled)) { \
+      if (TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE( \
+          category_group_enabled)) { \
         trace_event_internal::AddTraceEvent( \
             phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), name, \
             trace_event_internal::kNoEventId, flags, ##__VA_ARGS__); \
@@ -883,7 +890,8 @@ TRACE_EVENT_API_CLASS_EXPORT extern \
 #define INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name, ...) \
     INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
     trace_event_internal::ScopedTracer INTERNAL_TRACE_EVENT_UID(tracer); \
-    if (*INTERNAL_TRACE_EVENT_UID(category_group_enabled)) { \
+    if (TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE( \
+        category_group_enabled)) { \
       base::debug::TraceEventHandle h = trace_event_internal::AddTraceEvent( \
           TRACE_EVENT_PHASE_COMPLETE, \
           INTERNAL_TRACE_EVENT_UID(category_group_enabled), \
@@ -899,7 +907,8 @@ TRACE_EVENT_API_CLASS_EXPORT extern \
                                          flags, ...) \
     do { \
       INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-      if (*INTERNAL_TRACE_EVENT_UID(category_group_enabled)) { \
+      if (TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE( \
+          category_group_enabled)) { \
         unsigned char trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID; \
         trace_event_internal::TraceID trace_event_trace_id( \
             id, &trace_event_flags); \
@@ -916,7 +925,8 @@ TRACE_EVENT_API_CLASS_EXPORT extern \
         category_group, name, id, thread_id, timestamp, flags, ...) \
     do { \
       INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
-      if (*INTERNAL_TRACE_EVENT_UID(category_group_enabled)) { \
+      if (TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE( \
+          category_group_enabled)) { \
         unsigned char trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID; \
         trace_event_internal::TraceID trace_event_trace_id( \
             id, &trace_event_flags); \