chromeos: Avoid useless warning on lookup of display mode 0.

chromeos/display/output_configurator.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 "chromeos/display/output_configurator.h"
 
 #include <X11/Xlib.h>
 #include <X11/extensions/Xrandr.h>
 #include <X11/extensions/XInput2.h>
 
@@ skipping 151 matching lines @@
     return true;
   } else {
     return false;
   }
 }
 
 // static
 const OutputConfigurator::ModeInfo* OutputConfigurator::GetModeInfo(
     const OutputSnapshot& output,
     RRMode mode) {
+  if (mode == None)
+    return NULL;
+
   std::map<RRMode, ModeInfo>::const_iterator it = output.mode_infos.find(mode);
   if (it == output.mode_infos.end()) {
     LOG(WARNING) << "Unable to find info about mode " << mode
                  << " for output " << output.output;
     return NULL;
   }
   return &it->second;
 }
 
 OutputConfigurator::OutputConfigurator()
@@ skipping 514 matching lines @@
   float width_ratio = static_cast<float>(mirror_mode_info->width) /
       static_cast<float>(native_mode_info->width);
   float height_ratio = static_cast<float>(mirror_mode_info->height) /
       static_cast<float>(native_mode_info->height);
 
   area_ratio = width_ratio * height_ratio;
   return area_ratio;
 }
 
 }  // namespace chromeos