Support "learn more" link for EME in PermissionRequestManager code-path on Android

chrome/browser/permissions/grouped_permission_infobar_delegate_android.h

 // Copyright 2016 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_PERMISSIONS_GROUPED_PERMISSION_INFOBAR_DELEGATE_ANDROID_H_
 #define CHROME_BROWSER_PERMISSIONS_GROUPED_PERMISSION_INFOBAR_DELEGATE_ANDROID_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 31 matching lines @@
   base::string16 GetMessageTextFragment(size_t position) const;
 
   // Toggle accept value for an individual permission at |position|.
   void ToggleAccept(size_t position, bool new_value);
 
   // ConfirmInfoBarDelegate:
   base::string16 GetMessageText() const override;
   bool Accept() override;
   bool Cancel() override;
   void InfoBarDismissed() override;
+  base::string16 GetLinkText() const override;
 
  protected:
   bool GetAcceptState(size_t position);
 
  private:
   GroupedPermissionInfoBarDelegate(PermissionPromptAndroid* permission_prompt,
                                    const GURL& requesting_origin);
 
   // ConfirmInfoBarDelegate:
   InfoBarIdentifier GetIdentifier() const override;
   Type GetInfoBarType() const override;
   int GetButtons() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
+  GURL GetLinkURL() const override;
 
   // InfoBarDelegate:
   bool EqualsDelegate(infobars::InfoBarDelegate* delegate) const override;
 
   const GURL requesting_origin_;
   // Whether the accept/deny decision is persisted.
   bool persist_;
   PermissionPromptAndroid* permission_prompt_;
 
   DISALLOW_COPY_AND_ASSIGN(GroupedPermissionInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_GROUPED_PERMISSION_INFOBAR_DELEGATE_ANDROID_H_