Allow Oilpan heap objects account for their external allocations.

Source/core/dom/Text.h

Index: Source/core/dom/Text.h
diff --git a/Source/core/dom/Text.h b/Source/core/dom/Text.h
index 1b4c0bf5594927bb2172308c8adb85cf227810b9..e0bf2d0378c355623fa65af4b7ee9c8f9f07f0ee 100644
--- a/Source/core/dom/Text.h
+++ b/Source/core/dom/Text.h
@@ -61,6 +61,10 @@ public:
     virtual bool canContainRangeEndPoint() const override final { return true; }
     virtual NodeType nodeType() const override;
 
+#if ENABLE(OILPAN)

[haraken, 2015/02/19 23:47:43]

You can remove ENABLE(OILPAN). We normally add ENABLE(OILPAN) to the contents of
a trace method.

[sof, 2015/02/20 09:33:49]

I know :) Just didn't want to increase the vtbl of this rather common object in
a non-Oilpan setting at this stage of the project.

[haraken, 2015/02/23 08:42:27]

The Text object already has virtual methods, doesn't it?

[sof, 2015/02/23 12:26:13]

It does, that wasn't the concern, but if it would alter the size&layout of the
Text vtable, non-Oilpan. I've now verified that it doesn't, the trace slot is
merely overwritten with another unused method, hence I've dropped the use of the
#if here.

+    virtual void trace(Visitor*) override;
+#endif
+
 protected:
     Text(TreeScope& treeScope, const String& data, ConstructionType type)
         : CharacterData(treeScope, data, type) { }