Log messages regarding why app banners aren't displayed to the console

chrome/browser/banners/app_banner_debug_log.h

+// Copyright 2015 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_BANNERS_APP_BANNER_DEBUG_LOG_H_
+#define CHROME_BROWSER_BANNERS_APP_BANNER_DEBUG_LOG_H_
+
+#include <string>
+
+namespace content {
+class WebContents;
+}  // namespace content
+
+namespace banners {

[benwells, 2015/05/11 08:08:40]

Since we have a shiny new file (yay!) it would be good to get all the constants
for logging defined in here too.

[dominickn (DO NOT USE), 2015/05/12 07:41:31]

Done.

+
+// Logs a debug message to the main console if a banner could not be shown
+// and the engagement checks have been bypassed.
+void SendDebugMessage(content::WebContents* web_contents,
+                      const std::string& message);
+
+};  // namespace banners
+
+#endif  // CHROME_BROWSER_BANNERS_APP_BANNER_DEBUG_LOG_H_