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

chrome/common/render_messages.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.
 
 // Multiply-included file, no traditional include guard.
 #include <stdint.h>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 444 matching lines @@
 
 // Tells the renderer that a banner has been accepted.
 IPC_MESSAGE_ROUTED2(ChromeViewMsg_AppBannerAccepted,
                     int32_t /* request_id */,
                     std::string /* platform */)
 
 // Tells the renderer that a banner has been dismissed.
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_AppBannerDismissed,
                     int32_t /* request_id */)
 
+// Asks the renderer to log a debug message to console regarding an
+// app banner.
+IPC_MESSAGE_ROUTED1(ChromeViewMsg_AppBannerDebugMessageRequest,
+                    std::string /* message */)
+
 // Notification that the page has an OpenSearch description document
 // associated with it.
 IPC_MESSAGE_ROUTED3(ChromeViewHostMsg_PageHasOSDD,
                     GURL /* page_url */,
                     GURL /* osdd_url */,
                     search_provider::OSDDType)
 
 // Find out if the given url's security origin is installed as a search
 // provider.
 IPC_SYNC_MESSAGE_ROUTED2_1(ChromeViewHostMsg_GetSearchProviderInstallState,
@@ skipping 136 matching lines @@
 
 // Record a sample string to a Rappor metric.
 IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_RecordRappor,
                      std::string /* metric */,
                      std::string /* sample */)
 
 // Record a domain and registry of a url to a Rappor metric.
 IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_RecordRapporURL,
                      std::string /* metric */,
                      GURL /* sample url */)