WIP: Introduce CompressibleString

third_party/WebKit/Source/core/frame/DOMWindow.cpp

 // Copyright 2014 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 "core/frame/DOMWindow.h"
 
 #include "bindings/core/v8/ScriptCallStackFactory.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/SecurityContext.h"
 #include "core/events/MessageEvent.h"
 #include "core/frame/Frame.h"
 #include "core/frame/FrameClient.h"
 #include "core/frame/FrameConsole.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/Location.h"
 #include "core/frame/RemoteFrame.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/input/EventHandler.h"
 #include "core/inspector/ConsoleMessageStorage.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/ScriptCallStack.h"
 #include "core/loader/FrameLoaderClient.h"
 #include "core/loader/MixedContentChecker.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
+#include "platform/MemoryPurgeController.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/SecurityOrigin.h"
 
 namespace blink {
 
 DOMWindow::DOMWindow()
     : m_windowIsClosing(false)
 {
 }
 
@@ skipping 321 matching lines @@
         allowFocus = opener() && (opener() != this) && (toDocument(context)->domWindow() == opener());
     }
 
     // If we're a top level window, bring the window to the front.
     if (frame()->isMainFrame() && allowFocus)
         page->chromeClient().focus();
 
     page->focusController().focusDocumentView(frame(), true /* notifyEmbedder */);
 }
 
+void DOMWindow::purgeMemory(ExceptionState& exceptionState)
+{
+    Document* currentDocument = document();
+    if (!currentDocument || !currentDocument->page()) {
+        exceptionState.throwDOMException(InvalidAccessError, currentDocument ? "The document's page cannot be retrieved." : "No context document can be obtained.");
+        return;
+    }
+    MemoryPurgeController& controller = currentDocument->page()->memoryPurgeController();
+    controller.purgeMemory();
+}
+
 DEFINE_TRACE(DOMWindow)
 {
     visitor->trace(m_location);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink