Re-land alexbost's experimental offscreenTabs API.

chrome/browser/extensions/extension_tab_util.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_tab_util.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/sessions/restore_tab_helper.h"
 #include "chrome/browser/extensions/extension_tabs_module_constants.h"
+#include "chrome/browser/net/url_fixer_upper.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/url_constants.h"
 #include "content/public/browser/favicon_status.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
+#include "googleurl/src/gurl.h"
 
 namespace keys = extension_tabs_module_constants;
 namespace errors = extension_manifest_errors;
 
 using content::NavigationEntry;
 using content::WebContents;
 
 int ExtensionTabUtil::GetWindowId(const Browser* browser) {
   return browser->session_id().id();
 }
@@ skipping 188 matching lines @@
             *contents = target_contents;
           if (tab_index)
             *tab_index = i;
           return true;
         }
       }
     }
   }
   return false;
 }
+
+GURL ExtensionTabUtil::ResolvePossiblyRelativeURL(const std::string& url_string,
+                                                  const Extension* extension) {
+  GURL url = GURL(url_string);
+  if (!url.is_valid())
+    url = extension->GetResourceURL(url_string);
+
+  return url;
+}
+
+bool ExtensionTabUtil::IsCrashURL(const GURL& url) {
+  // Check a fixed-up URL, to normalize the scheme and parse hosts correctly.
+  GURL fixed_url =
+      URLFixerUpper::FixupURL(url.possibly_invalid_spec(), std::string());
+  return (fixed_url.SchemeIs(chrome::kChromeUIScheme) &&
+          (fixed_url.host() == chrome::kChromeUIBrowserCrashHost ||
+           fixed_url.host() == chrome::kChromeUICrashHost));
+}