Adds UMA for display color calibration in ChromeOS.

ui/display/chromeos/output_configurator.cc

 // Copyright 2014 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 "ui/display/chromeos/output_configurator.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 #include "base/time/time.h"
 #include "ui/display/chromeos/display_mode.h"
 #include "ui/display/chromeos/display_snapshot.h"
 #include "ui/display/chromeos/x11/native_display_delegate_x11.h"
 #include "ui/display/chromeos/x11/touchscreen_delegate_x11.h"
 
 namespace ui {
@@ skipping 373 matching lines @@
 
   return std::vector<ui::ColorCalibrationProfile>();
 }
 
 bool OutputConfigurator::SetColorCalibrationProfile(
     int64 display_id,
     ui::ColorCalibrationProfile new_profile) {
   for (size_t i = 0; i < cached_outputs_.size(); ++i) {
     if (cached_outputs_[i].display &&
         cached_outputs_[i].display->display_id() == display_id) {
-      return native_display_delegate_->SetColorCalibrationProfile(
+      bool succeed = native_display_delegate_->SetColorCalibrationProfile(
           *cached_outputs_[i].display, new_profile);
+      if (succeed) {
+        UMA_HISTOGRAM_ENUMERATION(
+            "ChromeOS.Display.ColorProfile",
+            new_profile,
+            COLOR_PROFILE_READING + 1);

[Alexei Svitkine (slow), 2014/03/26 13:02:10]

Can you add a new enum at the end for the size instead of adding 1 to some enum?
(Else if there's a new enum value added, this won't be correct anymore.)

[Jun Mukai, 2014/03/26 18:08:09]

Done.

+      }
+      return succeed;
     }
   }
 
   return false;
 }
 
 void OutputConfigurator::PrepareForExit() {
   configure_display_ = false;
 }
 
@@ skipping 608 matching lines @@
   float width_ratio = static_cast<float>(mirror_mode_info->size().width()) /
                       static_cast<float>(native_mode_info->size().width());
   float height_ratio = static_cast<float>(mirror_mode_info->size().height()) /
                        static_cast<float>(native_mode_info->size().height());
 
   area_ratio = width_ratio * height_ratio;
   return area_ratio;
 }
 
 }  // namespace ui