Oilpan: Introduce a state transition model for Oilpan GC states

Source/bindings/core/v8/V8GCController.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 433 matching lines @@
         // (2) X's DOM wrapper is created.
         // (3) The DOM wrapper becomes unreachable.
         // (4) V8 triggers a GC. The V8's GC collects the DOM wrapper.
         //     However, X is not collected until a next Oilpan's GC is
         //     triggered.
         // (5) If a lot of such DOM objects are created, we end up with
         //     a situation where V8's GC collects the DOM wrappers but
         //     the DOM objects are not collected forever. (Note that
         //     Oilpan's GC is not triggered unless Oilpan's heap gets full.)
         // (6) V8 hits OOM.
-        ThreadState::current()->setGCRequested();
+        ThreadState::current()->requestGC();
     }
 }
 
 void V8GCController::collectGarbage(v8::Isolate* isolate)
 {
     v8::HandleScope handleScope(isolate);
     RefPtr<ScriptState> scriptState = ScriptState::create(v8::Context::New(isolate), DOMWrapperWorld::create(isolate));
     ScriptState::Scope scope(scriptState.get());
     V8ScriptRunner::compileAndRunInternalScript(v8String(isolate, "if (gc) gc();"), isolate);
     scriptState->disposePerContextData();
@@ skipping 38 matching lines @@
     Visitor* m_visitor;
 };
 
 void V8GCController::traceDOMWrappers(v8::Isolate* isolate, Visitor* visitor)
 {
     DOMWrapperTracer tracer(visitor);
     v8::V8::VisitHandlesWithClassIds(isolate, &tracer);
 }
 
 } // namespace blink