WIP: Introduce CompressibleString

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

Index: third_party/WebKit/Source/core/frame/DOMWindow.cpp
diff --git a/third_party/WebKit/Source/core/frame/DOMWindow.cpp b/third_party/WebKit/Source/core/frame/DOMWindow.cpp
index 2a86da71d221ddebc047a2fb71340e0eb8a77c9a..2a0e23ea67619ac8d1591be3fcb10f02c1d9f879 100644
--- a/third_party/WebKit/Source/core/frame/DOMWindow.cpp
+++ b/third_party/WebKit/Source/core/frame/DOMWindow.cpp
@@ -27,6 +27,7 @@
 #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"
 
@@ -368,6 +369,17 @@ void DOMWindow::focus(ExecutionContext* context)
     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);