Oilpan: Added gyp flag to dump points-to graph information from the Blink GC plugin.

Source/core/xml/XSLImportRule.h

Index: Source/core/xml/XSLImportRule.h
diff --git a/Source/core/xml/XSLImportRule.h b/Source/core/xml/XSLImportRule.h
index 3521e696d9d4ac849528c4f893207a1a7db1f76d..163e099f0dfbf5788fecf54fa668594aac5a833c 100644
--- a/Source/core/xml/XSLImportRule.h
+++ b/Source/core/xml/XSLImportRule.h
@@ -63,6 +63,10 @@ private:
     // it should be a Member and be traced.
     XSLStyleSheet* m_parentStyleSheet;
     String m_strHref;
+
+    // FIXME: Oilpan: This persistent causes a direct cycle, but should not leak
+    // because XSLStyleSheet::m_children should only contain child import rules.
+    GC_PLUGIN_IGNORE_CYCLE

[haraken, 2014/03/21 10:31:40]

It's a bit inconsistent that we have a bug number on GC_PLUGIN_IGNORE but we
have a FIXME on GC_PLUGIN_IGNORE_CYCLE. (I'd prefer a FIXME though :-)

[zerny-chromium, 2014/03/21 10:46:19]

This only ignores the field with respect to the cycle detection code, so it has
limited impact (It does not signal a code issue or a plugin bug, just silences a
false positive). The other ignore is much more serious as simply acts as if the
field does not exist. Hopefully the use of GC_PLUGIN_IGNORE will be more
uncommon and the issue quickly resolved.

     RefPtrWillBePersistent<XSLStyleSheet> m_styleSheet;
     ResourcePtr<XSLStyleSheetResource> m_resource;
     bool m_loading;