Add use-chromium-style-naming option to Blink GC plugin.

tools/clang/blink_gc_plugin/tests/legacy_naming/member_in_offheap_class.txt

Index: tools/clang/blink_gc_plugin/tests/legacy_naming/member_in_offheap_class.txt
diff --git a/tools/clang/blink_gc_plugin/tests/legacy_naming/member_in_offheap_class.txt b/tools/clang/blink_gc_plugin/tests/legacy_naming/member_in_offheap_class.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9d5f2388dc8b3d140c87d7b6cbbef915658db8ff
--- /dev/null
+++ b/tools/clang/blink_gc_plugin/tests/legacy_naming/member_in_offheap_class.txt
@@ -0,0 +1,17 @@
+In file included from member_in_offheap_class.cpp:5:
+./member_in_offheap_class.h:14:1: warning: [blink-gc] Class 'OffHeapObject' contains invalid fields.
+class OffHeapObject {
+^
+./member_in_offheap_class.h:18:5: note: [blink-gc] Member field 'm_obj' in unmanaged class declared here:
+    Member<HeapObject> m_obj; // Must not contain Member.
+    ^
+./member_in_offheap_class.h:22:1: warning: [blink-gc] Class 'StackObject' contains invalid fields.
+class StackObject {
+^
+./member_in_offheap_class.h:26:5: note: [blink-gc] Member field 'm_memberOff' to non-GC managed class declared here:
+    Member<OffHeapObject> m_memberOff; // NOT OK
+    ^
+./member_in_offheap_class.h:27:5: note: [blink-gc] Member field 'm_heapVectorMemberOff' to non-GC managed class declared here:
+    HeapVector<Member<OffHeapObject>> m_heapVectorMemberOff; // NOT OK
+    ^
+2 warnings generated.