Make sudden termination into a counter....

chrome/renderer/renderer_webkitclient_impl.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_RENDERER_RENDERER_WEBKIT_CLIENT_IMPL_H_
 #define CHROME_RENDERER_RENDERER_WEBKIT_CLIENT_IMPL_H_
 
 #include "base/platform_file.h"
 #include "webkit/glue/simple_webmimeregistry_impl.h"
 #include "webkit/glue/webclipboard_impl.h"
 #include "webkit/glue/webkitclient_impl.h"
 
 #if defined(OS_WIN)
 #include "webkit/api/public/win/WebSandboxSupport.h"
 #elif defined(OS_LINUX)
 #include <string>
 #include <map>
 #include "base/lock.h"
 #include "webkit/api/public/linux/WebSandboxSupport.h"
 #endif
 
 class RendererWebKitClientImpl : public webkit_glue::WebKitClientImpl {
  public:
+  RendererWebKitClientImpl() : sudden_termination_disables_(0) {}
+
   // WebKitClient methods:
   virtual WebKit::WebClipboard* clipboard();
   virtual WebKit::WebMimeRegistry* mimeRegistry();
   virtual WebKit::WebSandboxSupport* sandboxSupport();
   virtual bool sandboxEnabled();
   virtual bool getFileSize(const WebKit::WebString& path, long long& result);
   virtual unsigned long long visitedLinkHash(
       const char* canonicalURL, size_t length);
   virtual bool isLinkVisited(unsigned long long linkHash);
   virtual WebKit::WebMessagePortChannel* createMessagePortChannel();
@@ skipping 48 matching lines @@
     std::map<std::string, std::string> unicode_font_families_;
   };
 #endif
 
   webkit_glue::WebClipboardImpl clipboard_;
 
   MimeRegistry mime_registry_;
 #if defined(OS_WIN) || defined(OS_LINUX)
   SandboxSupport sandbox_support_;
 #endif
+
+  // This counter keeps track of the number of times sudden termination is
+  // enabled or disabled. It starts at 0 (enabled) and for every disable
+  // increments by 1, for every enable decrements by 1. When it reaches 0,
+  // we tell the browser to enable fast termination.
+  int sudden_termination_disables_;
 };
 
 #endif  // CHROME_RENDERER_WEBKIT_CLIENT_IMPL_H_