Adds UMA for display color calibration in ChromeOS.

ash/display/display_manager.cc

Index: ash/display/display_manager.cc
diff --git a/ash/display/display_manager.cc b/ash/display/display_manager.cc
index 8c02f44e7a1e7e900c2a980536f363370e243cb7..31a78c411910331af15d178d6d06ce515e39ac1d 100644
--- a/ash/display/display_manager.cc
+++ b/ash/display/display_manager.cc
@@ -17,6 +17,7 @@
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
@@ -516,6 +517,8 @@ void DisplayManager::SetColorCalibrationProfile(
   if (Shell::GetInstance()->output_configurator()->SetColorCalibrationProfile(
           display_id, profile)) {
     display_info_[display_id].SetColorProfile(profile);
+    UMA_HISTOGRAM_ENUMERATION(
+        "ChromeOS.Display.ColorProfile", profile, ui::NUM_COLOR_PROFILES);
   }
   if (delegate_)
     delegate_->PostDisplayConfigurationChange();