Fix tab restore for view-source Chrome extension pages.

chrome/browser/chrome_content_browser_client.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/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 1296 matching lines @@
 }
 
 // These are treated as WebUI schemes but do not get WebUI bindings. Also,
 // view-source is allowed for these schemes.
 void ChromeContentBrowserClient::GetAdditionalWebUISchemes(
     std::vector<std::string>* additional_schemes) {
   additional_schemes->push_back(chrome::kChromeSearchScheme);
   additional_schemes->push_back(dom_distiller::kDomDistillerScheme);
 }
 
+void ChromeContentBrowserClient::GetAdditionalViewSourceSchemes(
+    std::vector<std::string>* additional_schemes) {
+  GetAdditionalWebUISchemes(additional_schemes);
+
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+  additional_schemes->push_back(extensions::kExtensionScheme);

[Charlie Reis, 2017/03/15 15:03:31]

I hate to add more plumbing, but I wonder if this line belongs in
ChromeContentBrowserClientExtensionsPart.  Devlin would probably know.

[alexmos, 2017/03/16 20:07:30]

Double-checked this with Devlin, and he's ok with leaving this as-is, given all
the other usage of kExtensionScheme.  Moving more/all of it out into
ChromeContentBrowserClientExtensionsPart can be done separately in the future.

+#endif
+}
+
 bool ChromeContentBrowserClient::LogWebUIUrl(const GURL& web_ui_url) const {
   return webui::LogWebUIUrl(web_ui_url);
 }
 
 bool ChromeContentBrowserClient::IsHandledURL(const GURL& url) {
   return ProfileIOData::IsHandledURL(url);
 }
 
 bool ChromeContentBrowserClient::CanCommitURL(
     content::RenderProcessHost* process_host,
@@ skipping 2224 matching lines @@
     RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectNonUINonIOBrowserThreads") == "true";
 }
 
 // static
 void ChromeContentBrowserClient::SetDefaultQuotaSettingsForTesting(
     const storage::QuotaSettings* settings) {
   g_default_quota_settings = settings;
 }