Add OptionsUI and its handler for multiple displays.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index b4585af9d938dc7b857924fad14776dd4e833cd6..03990b311161f7f8ac02a3fab46c4d1bcace9efb 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -13353,6 +13353,9 @@ Press any key to continue exploring.
       <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_ACCESSIBILITY">
         Accessibility
       </message>
+      <message name="IDS_OPTIONS_SETTINGS_SECTION_TITLE_DISPLAY">
+        Display
+      </message>
       <message name="IDS_OPTIONS_SETTINGS_TIMEZONE_DESCRIPTION" desc="In the settings tab, the text next to the timezone combobox.">
         Time zone:
       </message>
@@ -13494,6 +13497,15 @@ Press any key to continue exploring.
       <message name="IDS_OPTIONS_SETTINGS_ACCESSIBILITY_VIRTUAL_KEYBOARD_DESCRIPTION" desc="In the settings tab, the text next to the checkbox for virtual keyboard.">
         Enable virtual keyboard
       </message>
+      <message name="IDS_OPTIONS_SETTINGS_DISPLAY_OPTIONS_TAB_TITLE" desc="Title for the display settings tab.">
+	Manage displays
+      </message>
+      <message name="IDS_OPTIONS_SETTINGS_DISPLAY_OPTIONS_START_MIRRORING" desc="Button label to start display mirroring.">
+	Start mirroring
+      </message>
+      <message name="IDS_OPTIONS_SETTINGS_DISPLAY_OPTIONS_STOP_MIRRORING" desc="Button label to stop display mirroring.">
+	Stop mirroring
+      </message>
       <message name="IDS_OPTIONS_SETTINGS_KEYBOARD_LAYOUT_TEXT" desc="In the settings tab, the text of the keyboard layout label.">
         Keyboard layout:
       </message>