Oilpan: GC profiling.

Source/build/features.gypi

Index: Source/build/features.gypi
diff --git a/Source/build/features.gypi b/Source/build/features.gypi
index 7eec2d47fe69e394239bdebe13178e69304c81d6..042152c973c077c28b0ef22fafedfea3fa2eedf5 100644
--- a/Source/build/features.gypi
+++ b/Source/build/features.gypi
@@ -43,7 +43,8 @@
     'variables': {
       # Enables the Oilpan garbage-collection infrastructure.
       'enable_oilpan%': 0,
-      'gc_tracing%': 0,
+      'gc_profile_heap%': 0,
+      'gc_profile_marking%': 0,
       'blink_asserts_always_on%': 0,
     },
     'conditions': [
@@ -87,9 +88,16 @@
           'ENABLE_OILPAN=1',
         ],
       }],
-      ['gc_tracing==1', {
+      ['gc_profile_heap==1', {
         'feature_defines': [
-          'ENABLE_GC_TRACING=1',
+          'ENABLE_GC_PROFILING=1',
+          'ENABLE_GC_PROFILE_HEAP=1',
+        ],
+      }],
+      ['gc_profile_marking==1', {
+        'feature_defines': [
+          'ENABLE_GC_PROFILING=1',
+          'ENABLE_GC_PROFILE_MARKING=1',
         ],
       }],
       ['blink_asserts_always_on==1', {