Add tests for ShellWindowLinkDelegate::OpenURLFromTab

chrome/browser/ui/apps/chrome_shell_window_delegate.cc

Index: chrome/browser/ui/apps/chrome_shell_window_delegate.cc
diff --git a/chrome/browser/ui/apps/chrome_shell_window_delegate.cc b/chrome/browser/ui/apps/chrome_shell_window_delegate.cc
index c77bd5d814aa91bbf318a507cde3a0307219f473..151ccc2c33d1ade23666772ba9919efffcc09a39 100644
--- a/chrome/browser/ui/apps/chrome_shell_window_delegate.cc
+++ b/chrome/browser/ui/apps/chrome_shell_window_delegate.cc
@@ -59,10 +59,16 @@ ChromeShellWindowDelegate::ChromeShellWindowDelegate() {}
 
 ChromeShellWindowDelegate::~ChromeShellWindowDelegate() {}
 
+// static
 void ChromeShellWindowDelegate::DisableExternalOpenForTesting() {
   disable_external_open_for_testing_ = true;
 }
 
+// static
+void ChromeShellWindowDelegate::EnableExternalOpenForTesting() {
+  disable_external_open_for_testing_ = false;
+}
+
 void ChromeShellWindowDelegate::InitWebContents(
     content::WebContents* web_contents) {
   FaviconTabHelper::CreateForWebContents(web_contents);