Low memory page navigation GC for low end devices

third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 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 45 matching lines @@
 WindowProxy::WindowProxy(v8::Isolate* isolate,
                          Frame& frame,
                          RefPtr<DOMWrapperWorld> world)
     : isolate_(isolate),
       frame_(frame),
 
       world_(std::move(world)),
       lifecycle_(Lifecycle::kContextIsUninitialized) {}
 
 void WindowProxy::ClearForClose() {
-  DisposeContext(Lifecycle::kFrameIsDetached);
+  DisposeContext(Lifecycle::kFrameIsDetached, kFrameWillNotBeReused);
 }
 
 void WindowProxy::ClearForNavigation() {
-  DisposeContext(Lifecycle::kGlobalObjectIsDetached);
+  DisposeContext(Lifecycle::kGlobalObjectIsDetached, kFrameWillBeReused);
+}
+
+void WindowProxy::ClearForSwap() {
+  DisposeContext(Lifecycle::kGlobalObjectIsDetached, kFrameWillNotBeReused);
 }
 
 v8::Local<v8::Object> WindowProxy::GlobalProxyIfNotDetached() {
   if (lifecycle_ == Lifecycle::kContextIsInitialized) {
     DLOG_IF(FATAL, !is_global_object_attached_)
         << "Context is initialized but global object is detached!";
     return global_proxy_.NewLocal(isolate_);
   }
   return v8::Local<v8::Object>();
 }
@@ skipping 80 matching lines @@
                                  wrapper)) {
     WrapperTypeInfo::WrapperCreated();
     V8DOMWrapper::SetNativeInfo(isolate_, wrapper, wrapper_type_info, window);
     DCHECK(V8DOMWrapper::HasInternalFieldsSet(wrapper));
   }
   SECURITY_CHECK(ToScriptWrappable(wrapper) == window);
   return wrapper;
 }
 
 }  // namespace blink