Add an infobar if a session is being controlled by an automated test.

chrome/browser/ui/startup/chromedriver_infobar_delegate.h

Index: chrome/browser/ui/startup/chromedriver_infobar_delegate.h
diff --git a/chrome/browser/ui/startup/chromedriver_infobar_delegate.h b/chrome/browser/ui/startup/chromedriver_infobar_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..a0ba373b27a7fe3113f82a6840f2d2a7d026712f
--- /dev/null
+++ b/chrome/browser/ui/startup/chromedriver_infobar_delegate.h
@@ -0,0 +1,34 @@
+// Copyright 2017 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_UI_STARTUP_CHROMEDRIVER_INFOBAR_DELEGATE_H_
+#define CHROME_BROWSER_UI_STARTUP_CHROMEDRIVER_INFOBAR_DELEGATE_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "components/infobars/core/confirm_infobar_delegate.h"
+#include "url/gurl.h"
+
+class Browser;
+
+class ChromeDriverInfoBarDelegate : public ConfirmInfoBarDelegate {

[Devlin, 2017/02/06 16:20:21]

We should add a class-level comment here, e.g.
// An infobar to inform the user that their browser is being controlled by the
ChromeDriver extension.

[samuong, 2017/02/07 19:11:09]

Done.

+ public:
+  static void Create(Browser* browser);
+
+ private:
+  ChromeDriverInfoBarDelegate();
+  ~ChromeDriverInfoBarDelegate() override;
+
+  infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
+  base::string16 GetMessageText() const override;
+  int GetButtons() const override;
+  base::string16 GetLinkText() const override;
+  GURL GetLinkURL() const override;
+  bool ShouldExpire(const NavigationDetails& details) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeDriverInfoBarDelegate);
+};
+
+#endif  // CHROME_BROWSER_UI_STARTUP_CHROMEDRIVER_INFOBAR_DELEGATE_H_