Fix tab restore for view-source Chrome extension pages.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 6608c6a17c724c9b4e2095c08c1408f79f510bdf..20a9a6d7da4c7499f3595c477e1721fb1b013f4d 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -1314,6 +1314,15 @@ void ChromeContentBrowserClient::GetAdditionalWebUISchemes(
   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);
 }