Forward handling of low-mem message to the content renderer client. Add APIs to handle this case.

chrome/renderer/spellchecker/spellcheck.h

 // Copyright (c) 2011 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_SPELLCHECKER_SPELLCHECK_H_
 #define CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
 #include "base/string16.h"
 #include "base/time.h"
 #include "chrome/renderer/spellchecker/spellcheck_worditerator.h"
 #include "content/renderer/render_process_observer.h"
 #include "ipc/ipc_platform_file.h"
 #include "unicode/uscript.h"
 
 class Hunspell;
 
+namespace chrome {
+class ChromeContentRendererClient;
+}
+
 namespace file_util {
 class MemoryMappedFile;
 }
 
 // TODO(morrita): Needs reorg with SpellCheckProvider.
 // See http://crbug.com/73699.
 class SpellCheck : public RenderProcessObserver {
  public:
-  SpellCheck();
+  explicit SpellCheck(chrome::ChromeContentRendererClient* renderer_client);
   virtual ~SpellCheck();
 
   void Init(base::PlatformFile file,
             const std::vector<std::string>& custom_words,
             const std::string& language);
 
   // SpellCheck a word.
   // Returns true if spelled correctly, false otherwise.
   // If the spellchecker failed to initialize, always returns true.
   // The |tag| parameter should either be a unique identifier for the document
@@ skipping 85 matching lines @@
   // True if a platform-specific spellchecking engine is being used,
   // and False if hunspell is being used.
   bool is_using_platform_spelling_engine_;
 
   // This flags whether we have ever been initialized, or have asked the browser
   // for a dictionary. The value indicates whether we should request a
   // dictionary from the browser when the render view asks us to check the
   // spelling of a word.
   bool initialized_;
 
+  // Reference to the renderer client, for resetting the spellchecker on low-mem
+  // event. Weak reference.
+  chrome::ChromeContentRendererClient* renderer_client_;
+
   DISALLOW_COPY_AND_ASSIGN(SpellCheck);
 };
 
 #endif  // CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_