Update entry page type to include error pages when appropriate.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 14cf8a42cbf21eccfb415e69ffb85cac85fb0cd7..96201e4f659e82ea85c1b5a9eb3306c7b2066fb6 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -2574,12 +2574,14 @@ void WebContentsImpl::DidRedirectProvisionalLoad(
 void WebContentsImpl::DidCommitProvisionalLoad(
     RenderFrameHostImpl* render_frame_host,
     const GURL& url,
+    bool url_is_unreachable,
     ui::PageTransition transition_type) {
   // Notify observers about the commit of the provisional load.
-  FOR_EACH_OBSERVER(WebContentsObserver,
-                    observers_,
-                    DidCommitProvisionalLoadForFrame(
-                        render_frame_host, url, transition_type));
+  FOR_EACH_OBSERVER(
+      WebContentsObserver,
+      observers_,
+      DidCommitProvisionalLoadForFrame(
+          render_frame_host, url, url_is_unreachable, transition_type));

[wjmaclean, 2014/09/22 17:11:13]

We could avoid touching a lot of files if we stored the url_is_unreachable state
in WebContents, and retrieved it with WebContents::IsUrlReachable() ... does
that seem reasonable?

 }
 
 void WebContentsImpl::DidNavigateMainFramePreCommit(