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 "config.h"
 #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/Settings.h"
 #include "core/frame/UseCounter.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/Page.h"
+#include "platform/MemoryPurgeController.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/SecurityOrigin.h"
 
 namespace blink {
 
 DOMWindow::DOMWindow()
     : m_windowIsClosing(false)
 {
 }
 
@@ skipping 296 matching lines @@
 
     page->chromeClient().closeWindowSoon();
 
     // So as to make window.closed return the expected result
     // after window.close(), separately record the to-be-closed
     // state of this window. Scripts may access window.closed
     // before the deferred close operation has gone ahead.
     m_windowIsClosing = true;
 }
 
+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(MemoryPurgeMode::NotSpecified);
+}
+
 DEFINE_TRACE(DOMWindow)
 {
     visitor->trace(m_location);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink