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 435 matching lines @@
 // Tells the browser that we blocked a plugin because NPAPI is not supported.
 IPC_MESSAGE_ROUTED1(ChromeViewHostMsg_NPAPINotSupported,
                     std::string /* identifer */)
 
 // Asks the renderer whether an app banner should be shown. It will reply with
 // ChromeViewHostMsg_AppBannerPromptReply.
 IPC_MESSAGE_ROUTED2(ChromeViewMsg_AppBannerPromptRequest,
                     int /* request_id */,
                     std::string /* platform */)
 
+// Asks the renderer to log a debug message to console regarding a
+// non-displayed app banner

[benwells, 2015/05/07 01:57:20]

Nit: techincally this is incorrect as we also log a message for banners that are
shown. Maybe just '... regarding app banners.'

[dominickn (DO NOT USE), 2015/05/07 05:37:24]

Done.

+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 */)