Low memory page navigation GC for low end devices

third_party/WebKit/Source/bindings/core/v8/WindowProxyManager.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 "bindings/core/v8/WindowProxyManager.h"
 
 #include "platform/bindings/DOMWrapperWorld.h"
 
 namespace blink {
 
 DEFINE_TRACE(WindowProxyManager) {
   visitor->Trace(frame_);
   visitor->Trace(window_proxy_);
   visitor->Trace(isolated_worlds_);
 }
 
 void WindowProxyManager::ClearForClose() {
   window_proxy_->ClearForClose();
   for (auto& entry : isolated_worlds_)
     entry.value->ClearForClose();
 }
 
 void WindowProxyManager::ClearForNavigation() {
   window_proxy_->ClearForNavigation();
   for (auto& entry : isolated_worlds_)
     entry.value->ClearForNavigation();
 }
 
+void WindowProxyManager::ClearForSwap() {
+  window_proxy_->ClearForSwap();
+  for (auto& entry : isolated_worlds_)
+    entry.value->ClearForSwap();
+}
+
 void WindowProxyManager::ReleaseGlobalProxies(
     GlobalProxyVector& global_proxies) {
   DCHECK(global_proxies.IsEmpty());
   global_proxies.ReserveInitialCapacity(1 + isolated_worlds_.size());
   global_proxies.emplace_back(&window_proxy_->World(),
                               window_proxy_->ReleaseGlobalProxy());
   for (auto& entry : isolated_worlds_) {
     global_proxies.emplace_back(
         &entry.value->World(),
         WindowProxyMaybeUninitialized(entry.value->World())
@@ skipping 56 matching lines @@
   for (auto& entry : isolated_worlds_) {
     auto* isolated_window_proxy =
         static_cast<LocalWindowProxy*>(entry.value.Get());
     SecurityOrigin* isolated_security_origin =
         isolated_window_proxy->World().IsolatedWorldSecurityOrigin();
     isolated_window_proxy->UpdateSecurityOrigin(isolated_security_origin);
   }
 }
 
 }  // namespace blink