Allow zooming error pages.

This CL operates by providing a mechanism in HostZoomMap to convert urls
into the error-page url when an error page is loaded. The error-page
url is used to track the zoom-levels for error pages. Callers to
HostZoomMap::SetZoomLevelForHost*() functions are expected to convert
URLs obtained from NavigationEntrys before setting zoom levels.

HostZoomMap is also modified to add a function to transmit the zoom
level for a newly loaded error page, since it doesn't follow the usual
loading pathway. The transmission of the zoom level is triggered
when an error page is detected in
NavigationControllerImpl::RendererDidNavigateToNewPage().

The CL also creates a localization string to represent error pages in
the Content Settings page list of hosts with non-default zooms, this
since the internal url representations for error pages are not suitable
to be displayed to a user.

BUG=417699

Review URL: https://codereview.chromium.org/678963003

Cr-Commit-Position: refs/heads/master@{#301707}

1 files changed, 2 insertions, 0 deletions

diff --git a/content/browser/host_zoom_map_impl.h b/content/browser/host_zoom_map_impl.h
index d2a8a67..78d643d 100644
--- a/content/browser/host_zoom_map_impl.h
+++ b/content/browser/host_zoom_map_impl.h
@@ -86,6 +86,8 @@ class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap),
                const NotificationSource& source,
                const NotificationDetails& details) override;
 
+  void SendErrorPageZoomLevelRefresh();
+
  private:
   typedef std::map<std::string, double> HostZoomLevels;
   typedef std::map<std::string, HostZoomLevels> SchemeHostZoomLevels;