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

tools/clang/blink_gc_plugin/Config.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "Config.h"
 
 #include <cassert>
 
 #include "clang/AST/AST.h"
 
 using namespace clang;
 
+// Legacy names to be removed after Blink rename:
+namespace legacy {
+const char kCreateName[] = "create";
+const char kTraceName[] = "trace";
+const char kTraceImplName[] = "traceImpl";
+const char kFinalizeName[] = "finalizeGarbageCollectedObject";
+const char kTraceAfterDispatchName[] = "traceAfterDispatch";
+const char kTraceAfterDispatchImplName[] = "traceAfterDispatchImpl";
+const char kRegisterWeakMembersName[] = "registerWeakMembers";
+const char kAdjustAndMarkName[] = "adjustAndMark";
+const char kIsHeapObjectAliveName[] = "isHeapObjectAlive";
+}  // namespace legacy
+
+const char kNewOperatorName[] = "operator new";
+const char* kCreateName = "Create";
+const char* kTraceName = "Trace";
+const char* kTraceImplName = "TraceImpl";
+const char* kFinalizeName = "FinalizeGarbageCollectedObject";
+const char* kTraceAfterDispatchName = "TraceAfterDispatch";
+const char* kTraceAfterDispatchImplName = "TraceAfterDispatchImpl";
+const char* kRegisterWeakMembersName = "RegisterWeakMembers";
+const char kHeapAllocatorName[] = "HeapAllocator";
+const char kTraceIfNeededName[] = "TraceIfNeeded";
+const char kVisitorDispatcherName[] = "VisitorDispatcher";
+const char kVisitorVarName[] = "visitor";
+const char* kAdjustAndMarkName = "AdjustAndMark";
+const char* kIsHeapObjectAliveName = "IsHeapObjectAlive";
+const char kIsEagerlyFinalizedName[] = "IsEagerlyFinalizedMarker";
+
+void Config::UseLegacyNames() {
+  kCreateName = legacy::kCreateName;
+  kTraceName = legacy::kTraceName;
+  kTraceImplName = legacy::kTraceImplName;
+  kFinalizeName = legacy::kFinalizeName;
+  kTraceAfterDispatchName = legacy::kTraceAfterDispatchName;
+  kTraceAfterDispatchImplName = legacy::kTraceAfterDispatchImplName;
+  kRegisterWeakMembersName = legacy::kRegisterWeakMembersName;
+  kAdjustAndMarkName = legacy::kAdjustAndMarkName;
+  kIsHeapObjectAliveName = legacy::kIsHeapObjectAliveName;
+}
+
 bool Config::IsTemplateInstantiation(CXXRecordDecl* record) {
   ClassTemplateSpecializationDecl* spec =
       dyn_cast<clang::ClassTemplateSpecializationDecl>(record);
   if (!spec)
     return false;
   switch (spec->getTemplateSpecializationKind()) {
     case TSK_ImplicitInstantiation:
     case TSK_ExplicitInstantiationDefinition:
       return true;
     case TSK_Undeclared:
     case TSK_ExplicitSpecialization:
       return false;
     // TODO: unsupported cases.
     case TSK_ExplicitInstantiationDeclaration:
       return false;
   }
   assert(false && "Unknown template specialization kind");
   return false;
 }