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..42afbd9c0a2379fd34751e6e4df6e01482f02dec 100644
--- a/Source/build/features.gypi
+++ b/Source/build/features.gypi
@@ -86,6 +86,8 @@
       ['enable_oilpan==1', {
         'feature_defines': [
           'ENABLE_OILPAN=1',
+          'ENABLE_LAZY_SWEEPING=1',
+          'ENABLE_IDLE_GC=1',
           'ENABLE_INLINED_TRACE=1',
         ],
       }],

[peria, 2015/06/02 09:11:32]

We need
['enable_lazy_sweeping=1', {'feature_defines': ['ENABLE_LAZY_SWEEPING=1']}],
['enable_idle_gc=1', {'feature_defines': ['ENABLE_IDLE_GC=1']}]
to enable to change behaviors by GYP_DEFINES.

[haraken, 2015/06/02 09:19:41]

I'm not sure if we need to expose those flags to GYP. These flags are very
temporary ones, so yutakp and I were expecting that you edit features.gypi
locally.