Oilpan: Add ENABLE_LAZY_SWEEPING and ENABLE_IDLE_GC to features.gypi

Source/build/features.gypi

Index: Source/build/features.gypi
diff --git a/Source/build/features.gypi b/Source/build/features.gypi
index feda801c9f25a5e35a07d8cb8b36f34ba99332d3..aa16d2be4c32c5b71f0778cedbebeddc303365c9 100644
--- a/Source/build/features.gypi
+++ b/Source/build/features.gypi
@@ -86,8 +86,15 @@
       ['enable_oilpan==1', {
         'feature_defines': [
           'ENABLE_OILPAN=1',
+          'ENABLE_LAZY_SWEEPING=1',
+          'ENABLE_IDLE_GC=1',
           'ENABLE_INLINED_TRACE=1',
         ],
+      }, {
+        'feature_defines': [

[peria, 2015/06/02 09:03:24]

Please do either one of following items.
1. Leave TODO comments that are removed in some .h files here.
2. Remove this "else" part.  We can assume ENABLE(FOO) is false by default.

+          'ENABLE_LAZY_SWEEPING=0',
+          'ENABLE_IDLE_GC=0',
+        ],
       }],
       ['blink_gc_profiling==1', {
         'feature_defines': [