WIP: Introduce CompressibleString

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 892 matching lines @@
 void LocalFrame::updateFrameSecurityOrigin()
 {
     SecurityContext* context = securityContext();
     if (!context)
         return;
 
     WebSecurityOrigin securityOrigin(context->securityOrigin());
     frameScheduler()->setFrameOrigin(&securityOrigin);
 }
 
+void LocalFrame::compressStrings()
+{
+    V8PerIsolateData* perIsolateData = V8PerIsolateData::from(script().isolate());
+    perIsolateData->compressStrings();
+    // TODO: See children frames?

[haraken, 2015/11/24 11:15:42]

No. V8PerIsolateData is per-thread, not per-frame.

I don't think that LocalFrame is a good place to dispatch compressStrings, but
let's worry about this issue later.

[hajimehoshi, 2015/11/26 10:49:13]

I've changed to call CompressibleStringImpl::purgeMemory.

+}
+
 DEFINE_WEAK_IDENTIFIER_MAP(LocalFrame);
 
 FrameNavigationDisabler::FrameNavigationDisabler(LocalFrame& frame)
     : m_frame(&frame)
 {
     m_frame->disableNavigation();
 }
 
 FrameNavigationDisabler::~FrameNavigationDisabler()
 {
     m_frame->enableNavigation();
 }
 
 } // namespace blink