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

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index ad629bd7abeee5c0bcd6e2bc7b33dd97373138fc..8612c8aa7be0f255e1acbeab6eec55534e01df0a 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -15,6 +15,7 @@ class ExtensionDispatcher;
 class RendererHistogramSnapshots;
 class RendererNetPredictor;
 class SpellCheck;
+class SpellCheckProvider;
 class VisitedLinkSlave;
 
 namespace safe_browsing {
@@ -73,6 +74,10 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
   // For testing.
   void SetExtensionDispatcher(ExtensionDispatcher* extension_dispatcher);
 
+  // Called in low-memory conditions to dump the memory used by the spellchecker

[jam, 2011/07/22 16:31:50]

nit: why add two methods? i.e. why not just have the caller call ResetSpellCheck
directly?

[Greg Billock, 2011/07/22 17:02:07]

Good point. I liked having the caller call OnPurgeMemory so it's more
self-documenting when this happens and the call sequence, but there's no reason
for an extra signature here. Removed ResetSpellCheck and just did it in
OnPurgeMemory.

+  // and start over.
+  void OnPurgeMemory();
+
  private:
   WebKit::WebPlugin* CreatePluginPlaceholder(
       RenderView* render_view,
@@ -88,11 +93,14 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
   // extension app's extent.
   bool CrossesExtensionExtents(WebKit::WebFrame* frame, const GURL& new_url);
 
+  void ResetSpellCheck();
+
   scoped_ptr<ChromeRenderProcessObserver> chrome_observer_;
   scoped_ptr<ExtensionDispatcher> extension_dispatcher_;
   scoped_ptr<RendererHistogramSnapshots> histogram_snapshots_;
   scoped_ptr<RendererNetPredictor> net_predictor_;
   scoped_ptr<SpellCheck> spellcheck_;
+  scoped_ptr<SpellCheckProvider> spellcheck_provider_;
   scoped_ptr<VisitedLinkSlave> visited_link_slave_;
   scoped_ptr<safe_browsing::PhishingClassifierFilter> phishing_classifier_;
 };