Blink GC plugin: Fix tests after addition of const qual

TBR=haraken@chromium.org, omerkatz@chromium.org

Bug: 1058608
Change-Id: I03330f4aecf276cf994cb34362e3605b616e3886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088637Reviewed-by: Reid Kleckner <rnk@chromium.org>
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747022}

tools/clang/blink_gc_plugin/tests/finalize_after_dispatch.txt

@@ -2,7 +2,7 @@ In file included from finalize_after_dispatch.cpp:5:
 ./finalize_after_dispatch.h:12:1: warning: [blink-gc] Class 'NeedsDispatch' is missing manual trace dispatch.
 class NeedsDispatch : public GarbageCollected<NeedsDispatch> {
 ^
-finalize_after_dispatch.cpp:30:1: warning: [blink-gc] Missing dispatch to class 'D' in manual finalize dispatch.
+finalize_after_dispatch.cpp:28:1: warning: [blink-gc] Missing dispatch to class 'D' in manual finalize dispatch.
 void A::FinalizeGarbageCollectedObject()
 ^
 2 warnings generated.

tools/clang/blink_gc_plugin/tests/trace_after_dispatch.cpp

@@ -6,16 +6,17 @@
 
 namespace blink {
 
-static B* toB(A* a) { return static_cast<B*>(a); }
+static const B* toB(const A* a) {
+  return static_cast<const B*>(a);
+}
 
-void A::Trace(Visitor* visitor)
-{
+void A::Trace(Visitor* visitor) const {
   switch (m_type) {
     case TB:
       toB(this)->TraceAfterDispatch(visitor);
       break;
     case TC:
-        static_cast<C*>(this)->TraceAfterDispatch(visitor);
+      static_cast<const C*>(this)->TraceAfterDispatch(visitor);
       break;
     case TD:
       // Missing static_cast<D*>(this)->TraceAfterDispatch(visitor);

tools/clang/blink_gc_plugin/tests/trace_after_dispatch.h

@@ -10,14 +10,15 @@
 namespace blink {
 
 class A : public GarbageCollected<A> {
-public:
-    void Trace(Visitor*);
+ public:
+  void Trace(Visitor*) const;
   void TraceAfterDispatch(Visitor*) const;
 
  protected:
   enum Type { TB, TC, TD };
-    A(Type type) : m_type(type) { }
-private:
+  A(Type type) : m_type(type) {}
+
+ private:
   Type m_type;
 };
 

tools/clang/blink_gc_plugin/tests/trace_after_dispatch.txt

-trace_after_dispatch.cpp:11:1: warning: [blink-gc] Missing dispatch to class 'D' in manual trace dispatch.
-void A::Trace(Visitor* visitor)
+trace_after_dispatch.cpp:13:1: warning: [blink-gc] Missing dispatch to class 'D' in manual trace dispatch.
+void A::Trace(Visitor* visitor) const {
 ^
-trace_after_dispatch.cpp:30:1: warning: [blink-gc] Base class 'A' of derived class 'B' requires tracing.
-void B::TraceAfterDispatch(Visitor* visitor) const
+trace_after_dispatch.cpp:29:1: warning: [blink-gc] Base class 'A' of derived class 'B' requires tracing.
+void B::TraceAfterDispatch(Visitor* visitor) const {
 ^
-trace_after_dispatch.cpp:38:1: warning: [blink-gc] Class 'C' has untraced fields that require tracing.
-void C::TraceAfterDispatch(Visitor* visitor) const
+trace_after_dispatch.cpp:36:1: warning: [blink-gc] Class 'C' has untraced fields that require tracing.
+void C::TraceAfterDispatch(Visitor* visitor) const {
 ^
-./trace_after_dispatch.h:36:5: note: [blink-gc] Untraced field 'm_a' declared here:
+./trace_after_dispatch.h:40:5: note: [blink-gc] Untraced field 'm_a' declared here:
     Member<A> m_a;
     ^
 3 warnings generated.

tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl_error.txt

@@ -25,7 +25,7 @@ void TraceAfterDispatchExternBase::TraceAfterDispatch(Visitor* visitor) const {
   Member<X> x_base_;
   ^
 trace_after_dispatch_impl_error.cpp:38:1: warning: [blink-gc] Base class 'TraceAfterDispatchExternBase' of derived class 'TraceAfterDispatchExternDerived' requires tracing.
-void TraceAfterDispatchExternDerived::TraceAfterDispatch(Visitor* visitor) const {
+void TraceAfterDispatchExternDerived::TraceAfterDispatch(
 ^
 trace_after_dispatch_impl_error.cpp:38:1: warning: [blink-gc] Class 'TraceAfterDispatchExternDerived' has untraced fields that require tracing.
 ./trace_after_dispatch_impl_error.h:70:3: note: [blink-gc] Untraced field 'x_derived_' declared here:

tools/clang/blink_gc_plugin/tests/virtual_and_trace_after_dispatch.txt

@@ -2,7 +2,7 @@ In file included from virtual_and_trace_after_dispatch.cpp:5:
 ./virtual_and_trace_after_dispatch.h:12:1: warning: [blink-gc] Left-most base class 'A' of derived class 'B' must be polymorphic.
 class A : public GarbageCollected<A> {
 ^
-./virtual_and_trace_after_dispatch.h:23:1: warning: [blink-gc] Class 'B' contains or inherits virtual methods but implements manual dispatching.
+./virtual_and_trace_after_dispatch.h:24:1: warning: [blink-gc] Class 'B' contains or inherits virtual methods but implements manual dispatching.
 class B : public A {
 ^
 ./virtual_and_trace_after_dispatch.h:14:5: note: [blink-gc] Manual dispatch 'Trace' declared here: