Update entry page type to include error pages when appropriate.

chrome/browser/ui/zoom/zoom_controller.cc

Index: chrome/browser/ui/zoom/zoom_controller.cc
diff --git a/chrome/browser/ui/zoom/zoom_controller.cc b/chrome/browser/ui/zoom/zoom_controller.cc
index 95ab757f3f7d5bf75cc7c3956e7045ae7fb3afae..5d16d7119bc60d9ce1b2b55672a086ddb955099a 100644
--- a/chrome/browser/ui/zoom/zoom_controller.cc
+++ b/chrome/browser/ui/zoom/zoom_controller.cc
@@ -24,7 +24,8 @@ ZoomController::ZoomController(content::WebContents* web_contents)
       can_show_bubble_(true),
       zoom_mode_(ZOOM_MODE_DEFAULT),
       zoom_level_(1.0),
-      browser_context_(web_contents->GetBrowserContext()) {
+      browser_context_(web_contents->GetBrowserContext()),
+      is_error_page_(false) {
   // TODO(wjmaclean) Make calls to HostZoomMap::GetDefaultForBrowserContext()
   // refer to the webcontents-specific HostZoomMap when that becomes available.
   content::HostZoomMap* host_zoom_map =
@@ -79,9 +80,10 @@ bool ZoomController::SetZoomLevelByExtension(
     double zoom_level,
     const scoped_refptr<const extensions::Extension>& extension) {
   // Cannot zoom in disabled mode. Also, don't allow changing zoom level on
-  // a crashed tab.
+  // a crashed tab or an error page.
   if (zoom_mode_ == ZOOM_MODE_DISABLED ||
-      !web_contents()->GetRenderViewHost()->IsRenderViewLive())
+      !web_contents()->GetRenderViewHost()->IsRenderViewLive() ||
+      is_error_page_)
     return false;
 
   // Store extension data so that |extension| can be attributed when the zoom
@@ -239,6 +241,14 @@ void ZoomController::SetZoomMode(ZoomMode new_mode) {
   zoom_mode_ = new_mode;
 }
 
+void ZoomController::DidCommitProvisionalLoadForFrame(
+    content::RenderFrameHost* render_frame_host,
+    const GURL& url,
+    bool url_is_unreachable,
+    ui::PageTransition transition_type) {
+  is_error_page_ = url_is_unreachable;
+}
+
 void ZoomController::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {