Add initial support for runtime permissions in android M.

chrome/browser/content_settings/permission_infobar_delegate.h

Index: chrome/browser/content_settings/permission_infobar_delegate.h
diff --git a/chrome/browser/content_settings/permission_infobar_delegate.h b/chrome/browser/content_settings/permission_infobar_delegate.h
index 2f238b89832a4bd06061ba8b7608446bc2979c10..9fea4a3bb13c18b30ba17faa5d989f9dad6cd4aa 100644
--- a/chrome/browser/content_settings/permission_infobar_delegate.h
+++ b/chrome/browser/content_settings/permission_infobar_delegate.h
@@ -20,6 +20,9 @@ class PermissionQueueController;
 // provide an icon and a message text to the infobar.
 class PermissionInfobarDelegate : public ConfirmInfoBarDelegate {
 
+ public:
+  ContentSettingsType content_setting() const { return type_; }
+
  protected:
   PermissionInfobarDelegate(PermissionQueueController* controller,
                             const PermissionRequestID& id,
@@ -31,6 +34,7 @@ class PermissionInfobarDelegate : public ConfirmInfoBarDelegate {
   // ConfirmInfoBarDelegate:
   Type GetInfoBarType() const override;
   void InfoBarDismissed() override;
+  PermissionInfobarDelegate* AsPermissionInfobarDelegate() override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   bool Cancel() override;