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 442a2d7d36c649e224618198bd85fa70aa31290f..d37f29fd1b3a8c697a9b03d958e2bab0f5e056f1 100644
--- a/third_party/WebKit/Source/core/frame/DOMWindow.cpp
+++ b/third_party/WebKit/Source/core/frame/DOMWindow.cpp
@@ -25,6 +25,7 @@
 #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"
 
@@ -341,6 +342,17 @@ void DOMWindow::close(ExecutionContext* context)
     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);