diff -r 000000000000 -r 6474c204b198 dom/plugins/base/nsPluginLogging.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/base/nsPluginLogging.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Plugin Module Logging usage instructions and includes */
+////////////////////////////////////////////////////////////////////////////////
+#ifndef nsPluginLogging_h__
+#define nsPluginLogging_h__
+
+#define FORCE_PR_LOG /* Allow logging in the release build */
+#define PR_LOGGING 1
+
+#ifdef PR_LOGGING
+#include "prlog.h"
+
+#ifndef PLUGIN_LOGGING    // allow external override
+#define PLUGIN_LOGGING 1  // master compile-time switch for pluging logging
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Basic Plugin Logging Usage Instructions
+//
+// 1. Set this environment variable: NSPR_LOG_MODULES=<name>:<level>
+
+// Choose the <name> and <level> from this list (no quotes):
+
+// Log Names            <name>
+#define NPN_LOG_NAME    "PluginNPN"
+#define NPP_LOG_NAME    "PluginNPP"
+#define PLUGIN_LOG_NAME "Plugin"
+
+// Levels                <level>
+#define PLUGIN_LOG_ALWAYS 1
+#define PLUGIN_LOG_BASIC  3
+#define PLUGIN_LOG_NORMAL 5
+#define PLUGIN_LOG_NOISY  7
+#define PLUGIN_LOG_MAX    9
+
+// 2. You can combine logs and levels by separating them with a comma:
+//    My favorite Win32 Example: SET NSPR_LOG_MODULES=Plugin:5,PluginNPP:5,PluginNPN:5
+
+// 3. Instead of output going to the console, you can log to a file. Additionally, set the
+//    NSPR_LOG_FILE environment variable to point to the full path of a file.
+//    My favorite Win32 Example: SET NSPR_LOG_FILE=c:\temp\pluginLog.txt
+
+// 4. For complete information see the NSPR Reference: 
+//    http://www.mozilla.org/projects/nspr/reference/html/prlog.html
+
+
+#ifdef PLUGIN_LOGGING
+
+class nsPluginLogging
+{
+public:
+  static PRLogModuleInfo* gNPNLog;  // 4.x NP API, calls into navigator
+  static PRLogModuleInfo* gNPPLog;  // 4.x NP API, calls into plugin
+  static PRLogModuleInfo* gPluginLog;  // general plugin log
+};
+
+#endif   // PLUGIN_LOGGING
+
+#endif  // PR_LOGGING
+
+// Quick-use macros
+#ifdef PLUGIN_LOGGING
+ #define NPN_PLUGIN_LOG(a, b)                              \
+   PR_BEGIN_MACRO                                        \
+   PR_LOG(nsPluginLogging::gNPNLog, a, b); \
+   PR_LogFlush();                                                    \
+   PR_END_MACRO
+#else
+ #define NPN_PLUGIN_LOG(a, b)
+#endif
+
+#ifdef PLUGIN_LOGGING
+ #define NPP_PLUGIN_LOG(a, b)                              \
+   PR_BEGIN_MACRO                                         \
+   PR_LOG(nsPluginLogging::gNPPLog, a, b); \
+   PR_LogFlush();                                                    \
+   PR_END_MACRO
+#else
+ #define NPP_PLUGIN_LOG(a, b)
+#endif
+
+#ifdef PLUGIN_LOGGING
+ #define PLUGIN_LOG(a, b)                              \
+   PR_BEGIN_MACRO                                         \
+   PR_LOG(nsPluginLogging::gPluginLog, a, b); \
+   PR_LogFlush();                                                    \
+   PR_END_MACRO
+#else
+ #define PLUGIN_LOG(a, b)
+#endif
+
+#endif   // nsPluginLogging_h__
+