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

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index ee7db8e0a72e4b8a568906070be85010264247f5..6fa1133b5968d422027828b2df1b966548733bca 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -149,7 +149,7 @@ ChromeContentRendererClient::~ChromeContentRendererClient() {
 }
 
 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());
@@ -214,7 +214,8 @@ void ChromeContentRendererClient::RenderViewCreated(RenderView* render_view) {
   new PageLoadHistograms(render_view, histogram_snapshots_.get());
   new PrintWebViewHelper(render_view);
   new SearchBox(render_view);
-  new SpellCheckProvider(render_view, spellcheck_.get());
+  spellcheck_provider_.reset(new SpellCheckProvider(render_view,
+                                                    spellcheck_.get()));
 #if defined(ENABLE_SAFE_BROWSING)
   safe_browsing::MalwareDOMDetails::Create(render_view);
 #endif
@@ -624,4 +625,20 @@ bool ChromeContentRendererClient::CrossesExtensionExtents(WebFrame* frame,
   return !extensions->InSameExtent(old_url, new_url);
 }
 
+void ChromeContentRendererClient::OnPurgeMemory() {
+  ResetSpellCheck();
+}
+
+void ChromeContentRendererClient::ResetSpellCheck() {
+  LOG(INFO) << "Resetting spellcheck in renderer client";

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

nit: i believe people try to use VLOG now so that it's easier to filter only the
messages they want to see

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

Yeah, I'm going to strip out all this test code. A VLOG might be good, though.
I'll leave one of those here.

On 2011/07/22 16:31:50, John Abd-El-Malek wrote:

+  RenderThread* thread = RenderThread::current();
+  if (spellcheck_.get())
+    thread->RemoveObserver(spellcheck_.get());
+  SpellCheck* new_spellcheck = new SpellCheck();
+  if (spellcheck_provider_.get())
+    spellcheck_provider_->SetSpellCheck(new_spellcheck);
+  spellcheck_.reset(new_spellcheck);
+  thread->AddObserver(new_spellcheck);
+}
+
 }  // namespace chrome