Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/platform/WebThreadSupportingGC.cpp

Index: third_party/WebKit/Source/platform/WebThreadSupportingGC.cpp
diff --git a/third_party/WebKit/Source/platform/WebThreadSupportingGC.cpp b/third_party/WebKit/Source/platform/WebThreadSupportingGC.cpp
index bf50fd6262ed15a2121042490857072195626105..80110e55d9b68601520ddfe59be88f1079fa4ac7 100644
--- a/third_party/WebKit/Source/platform/WebThreadSupportingGC.cpp
+++ b/third_party/WebKit/Source/platform/WebThreadSupportingGC.cpp
@@ -11,18 +11,19 @@
 
 namespace blink {
 
-PassOwnPtr<WebThreadSupportingGC> WebThreadSupportingGC::create(const char* name)
+PassOwnPtr<WebThreadSupportingGC> WebThreadSupportingGC::create(const char* name, bool isolated)
 {
-    return adoptPtr(new WebThreadSupportingGC(name, nullptr));
+    return adoptPtr(new WebThreadSupportingGC(name, nullptr, isolated));
 }
 
-PassOwnPtr<WebThreadSupportingGC> WebThreadSupportingGC::createForThread(WebThread* thread)
+PassOwnPtr<WebThreadSupportingGC> WebThreadSupportingGC::createForThread(WebThread* thread, bool isolated)
 {
-    return adoptPtr(new WebThreadSupportingGC(nullptr, thread));
+    return adoptPtr(new WebThreadSupportingGC(nullptr, thread, isolated));
 }
 
-WebThreadSupportingGC::WebThreadSupportingGC(const char* name, WebThread* thread)
+WebThreadSupportingGC::WebThreadSupportingGC(const char* name, WebThread* thread, bool isolated)
     : m_thread(thread)
+    , m_isolated(isolated)
 {
 #if ENABLE(ASSERT)
     ASSERT(!name || !thread);
@@ -49,6 +50,7 @@ WebThreadSupportingGC::~WebThreadSupportingGC()
 void WebThreadSupportingGC::initialize()
 {
     ThreadState::attach();
+    ThreadState::current()->setIsolated(m_isolated);
     m_gcTaskRunner = adoptPtr(new GCTaskRunner(m_thread));
 }