Add a console message when a permission is embargoed due to repeated dismissals.

chrome/browser/permissions/permission_context_base.cc

Index: chrome/browser/permissions/permission_context_base.cc
diff --git a/chrome/browser/permissions/permission_context_base.cc b/chrome/browser/permissions/permission_context_base.cc
index be0dce6dc03e9f90f0ff4767d28f57d9d72e9c82..46a195754340282e5b3f424a52a5f94104b7742c 100644
--- a/chrome/browser/permissions/permission_context_base.cc
+++ b/chrome/browser/permissions/permission_context_base.cc
@@ -108,6 +108,16 @@ void PermissionContextBase::RequestPermission(
                   .c_str()));
       callback.Run(CONTENT_SETTING_BLOCK);
       return;
+    } else if (result.source == PermissionStatusSource::MULTIPLE_DISMISSALS) {
+      web_contents->GetMainFrame()->AddMessageToConsole(
+          content::CONSOLE_MESSAGE_LEVEL_INFO,
+          base::StringPrintf(
+              "%s permission has been blocked as the user has dismissed the "
+              "permission prompt several times. See "
+              "https://www.chromestatus.com/features/6443143280984064 for more "
+              "information.",
+              PermissionUtil::GetPermissionString(content_settings_type_)
+                  .c_str()));

[raymes, 2017/02/28 23:44:38]

nit: it would be nice to get some of this logging logic out of the main flow of
the permission logic. Could we have a helper function which does logging? e.g.

LogPermissionBlockedMessage(WebContents* web_contents, const std::string&
message, ContentSettingsType type)?

We may also want to make the strings into constants.

[dominickn, 2017/03/01 02:28:44]

Done.

     }
 
     // If we are under embargo, record the embargo reason for which we have