Revert "Remove kLogPluginMessages flag as part of flag cleanup."

content/public/common/content_switches.cc

 // 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.
 
 #include "content/public/common/content_switches.h"
 
 #include "base/command_line.h"
 
 namespace switches {
 
@@ skipping 649 matching lines @@
 // Logs GPU control list decisions when enforcing blacklist rules.
 const char kLogGpuControlListDecisions[]    = "log-gpu-control-list-decisions";
 
 // Sets the minimum log level. Valid values are from 0 to 3:
 // INFO = 0, WARNING = 1, LOG_ERROR = 2, LOG_FATAL = 3.
 const char kLoggingLevel[]                  = "log-level";
 
 // Enables saving net log events to a file and sets the file name to use.
 const char kLogNetLog[]                     = "log-net-log";
 
+// Make plugin processes log their sent and received messages to VLOG(1).
+const char kLogPluginMessages[]             = "log-plugin-messages";
+
 // Sets the width and height above which a composited layer will get tiled.
 const char kMaxUntiledLayerHeight[]         = "max-untiled-layer-height";
 const char kMaxUntiledLayerWidth[]          = "max-untiled-layer-width";
 
 // Sample memory usage with high frequency and store the results to the
 // Renderer.Memory histogram. Used in memory tests.
 const char kMemoryMetrics[]                 = "memory-metrics";
 
 // Mutes audio sent to the audio device so it is not audible during
 // automated testing.
@@ skipping 323 matching lines @@
 
 // Disables support for Core Animation plugins. This is triggered when
 // accelerated compositing is disabled. See http://crbug.com/122430 .
 const char kDisableCoreAnimationPlugins[] =
     "disable-core-animation-plugins";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches