Open a login tab on captive portal detection on SSL loads.

chrome/browser/captive_portal/captive_portal_tab_observer.h

Index: chrome/browser/captive_portal/captive_portal_tab_observer.h
===================================================================
--- chrome/browser/captive_portal/captive_portal_tab_observer.h	(revision 0)
+++ chrome/browser/captive_portal/captive_portal_tab_observer.h	(revision 0)
@@ -0,0 +1,72 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_OBSERVER_H_
+#define CHROME_BROWSER_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_OBSERVER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace captive_portal {
+
+class CaptivePortalTabHelper;
+
+// A WebContentsObserver that simplifies the messages a CaptivePortalTabHelper
+// receives.  It filters non-main-frame resource loads, and treats the commit
+// of an error page as a single event, rather than as 3 (ProvisionalLoadFail,
+// DidStartProvisionalLoad, DidCommit).
+//
+// TODO(mmenke): Support redirects.  Probably won't cause us to succussfully
+//               detect captive portals we wouldn't have handled anyways, but
+//               may reduce the number of unnecessary captive portal checks we
+//               run.
+class CaptivePortalTabObserver : public content::WebContentsObserver {
+ public:
+  CaptivePortalTabObserver(CaptivePortalTabHelper* tab_helper,
+                          content::WebContents* web_contents);
+  virtual ~CaptivePortalTabObserver();
+
+  // content::WebContentsObserver:
+  virtual void DidStartProvisionalLoadForFrame(
+      int64 frame_id,
+      bool is_main_frame,
+      const GURL& validated_url,
+      bool is_error_page,
+      content::RenderViewHost* render_view_host) OVERRIDE;
+
+  virtual void DidCommitProvisionalLoadForFrame(
+      int64 frame_id,
+      bool is_main_frame,
+      const GURL& url,
+      content::PageTransition transition_type) OVERRIDE;
+
+  virtual void DidFailProvisionalLoad(
+      int64 frame_id,
+      bool is_main_frame,
+      const GURL& validated_url,
+      int error_code,
+      const string16& error_description) OVERRIDE;
+
+  virtual void DidStopLoading() OVERRIDE;
+
+  content::WebContents* web_contents() const {
+    return content::WebContentsObserver::web_contents();
+  }
+
+ private:
+  // Our owner.
+  CaptivePortalTabHelper* tab_helper_;
+
+  // If a load has failed, and we're loading an error page, the error code
+  // associated with the error page we're loading.  net::OK, otherwise.
+  int pending_error_code_;
+
+  DISALLOW_COPY_AND_ASSIGN(CaptivePortalTabObserver);
+};
+
+}  // namespace captive_portal
+
+#endif  // CHROME_BROWSER_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_OBSERVER_H_