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

chrome/renderer/chrome_content_renderer_client.cc

 // 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.
 
 #include "chrome/renderer/chrome_content_renderer_client.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/message_loop.h"
@@ skipping 134 matching lines @@
 
 ChromeContentRendererClient::ChromeContentRendererClient() {
   chrome::InitializePPAPI();
 }
 
 ChromeContentRendererClient::~ChromeContentRendererClient() {
   chrome::UninitializePPAPI();
 }
 
 void ChromeContentRendererClient::RenderThreadStarted() {
-  chrome_observer_.reset(new ChromeRenderProcessObserver());
+  chrome_observer_.reset(new ChromeRenderProcessObserver(this));
   extension_dispatcher_.reset(new ExtensionDispatcher());
   histogram_snapshots_.reset(new RendererHistogramSnapshots());
   net_predictor_.reset(new RendererNetPredictor());
   spellcheck_.reset(new SpellCheck());
   visited_link_slave_.reset(new VisitedLinkSlave());
 #if defined(ENABLE_SAFE_BROWSING)
   phishing_classifier_.reset(safe_browsing::PhishingClassifierFilter::Create());
 #endif
 
   RenderThread* thread = RenderThread::current();
@@ skipping 42 matching lines @@
   WebSecurityPolicy::registerURLSchemeAsSecure(extension_scheme);
 }
 
 void ChromeContentRendererClient::RenderViewCreated(RenderView* render_view) {
   ContentSettingsObserver* content_settings =
       new ContentSettingsObserver(render_view);
   new ExtensionHelper(render_view, extension_dispatcher_.get());
   new PageLoadHistograms(render_view, histogram_snapshots_.get());
   new PrintWebViewHelper(render_view);
   new SearchBox(render_view);
-  new SpellCheckProvider(render_view, spellcheck_.get());
+  spellcheck_provider_ = new SpellCheckProvider(render_view, spellcheck_.get());
 #if defined(ENABLE_SAFE_BROWSING)
   safe_browsing::MalwareDOMDetails::Create(render_view);
 #endif
 
 #if defined(OS_MACOSX)
   new TextInputClientObserver(render_view);
 #endif  // defined(OS_MACOSX)
 
   PasswordAutofillManager* password_autofill_manager =
       new PasswordAutofillManager(render_view);
@@ skipping 456 matching lines @@
   // uninstalled.
   if (old_url == new_url) {
     bool is_extension_url = !!extensions->GetByURL(new_url);
     if (is_extension_url != extension_dispatcher_->is_extension_process())
       return true;
   }
 
   return !extensions->InSameExtent(old_url, new_url);
 }
 
+void ChromeContentRendererClient::OnPurgeMemory() {
+  DVLOG(1) << "Resetting spellcheck in renderer client";
+  RenderThread* thread = RenderThread::current();
+  if (spellcheck_.get())
+    thread->RemoveObserver(spellcheck_.get());
+  SpellCheck* new_spellcheck = new SpellCheck();
+  if (spellcheck_provider_)
+    spellcheck_provider_->SetSpellCheck(new_spellcheck);
+  spellcheck_.reset(new_spellcheck);
+  thread->AddObserver(new_spellcheck);
+}
+
 }  // namespace chrome