Make 'Google Smart Lock' a hyperlink in the password infobar on Mac.

components/infobars/core/confirm_infobar_delegate.h

 // 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.
 
 #ifndef COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_H_
 #define COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "components/infobars/core/infobar_delegate.h"
 #include "components/infobars/core/infobar_manager.h"
+#include "ui/gfx/range/range.h"
 
 namespace infobars {
 class InfoBar;
 class InfoBarManager;
 }
 
 // An interface derived from InfoBarDelegate implemented by objects wishing to
 // control a ConfirmInfoBar.
 class ConfirmInfoBarDelegate : public infobars::InfoBarDelegate {
  public:
   enum InfoBarButton {
     BUTTON_NONE   = 0,
     BUTTON_OK     = 1 << 0,
     BUTTON_CANCEL = 1 << 1,
   };
 
   ~ConfirmInfoBarDelegate() override;
 
   // Returns the InfoBar type to be displayed for the InfoBar.
   InfoBarAutomationType GetInfoBarAutomationType() const override;
 
   // Returns the message string to be displayed for the InfoBar.
   virtual base::string16 GetMessageText() const = 0;
 
+  // Defines the message substring to be displayed as a link.
+  virtual gfx::Range GetMessageLinkRange() const;
+
   // Returns the buttons to be shown for this InfoBar.
   virtual int GetButtons() const;
 
   // Returns the label for the specified button. The default implementation
   // returns "OK" for the OK button and "Cancel" for the Cancel button.
   virtual base::string16 GetButtonLabel(InfoBarButton button) const;
 
   // Returns whether or not the OK button will trigger a UAC elevation prompt on
   // Windows.
   virtual bool OKButtonTriggersUACPrompt() const;
 
   // Called when the OK button is pressed. If this function returns true, the
   // infobar is then immediately closed. Subclasses MUST NOT return true if in
   // handling this call something triggers the infobar to begin closing.
   virtual bool Accept();
 
   // Called when the Cancel button is pressed. If this function returns true,
   // the infobar is then immediately closed. Subclasses MUST NOT return true if
   // in handling this call something triggers the infobar to begin closing.
   virtual bool Cancel();
 
-  // Returns the text of the link to be displayed, if any. Otherwise returns
-  // and empty string.
+  // Returns the text of the link to be displayed after the message, if
+  // any. Otherwise returns and empty string.

[gone, 2015/06/05 17:44:25]

nit: while you're here, and -> an

   virtual base::string16 GetLinkText() const;
 
   // Called when the Link (if any) is clicked. The |disposition| specifies how
   // the resulting document should be loaded (based on the event flags present
   // when the link was clicked). If this function returns true, the infobar is
   // then immediately closed. Subclasses MUST NOT return true if in handling
   // this call something triggers the infobar to begin closing.
   virtual bool LinkClicked(WindowOpenDisposition disposition);
 
  protected:
   ConfirmInfoBarDelegate();
 
  private:
   // InfoBarDelegate:
   bool EqualsDelegate(infobars::InfoBarDelegate* delegate) const override;
   ConfirmInfoBarDelegate* AsConfirmInfoBarDelegate() override;
 
   DISALLOW_COPY_AND_ASSIGN(ConfirmInfoBarDelegate);
 };
 
 #endif  // COMPONENTS_INFOBARS_CORE_CONFIRM_INFOBAR_DELEGATE_H_