Disable Overscan option for internal display in display settings

Bug: 781747
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I128f64943031087f08bdf3f64c743bcbb7784694
Reviewed-on: https://chromium-review.googlesource.com/820094
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523988}

chrome/browser/resources/settings/device_page/display.html

@@ -175,7 +175,8 @@
 
       <button is="cr-link-row" icon-class="subpage-arrow" class="indented hr"
           id="overscan" label="$i18n{displayOverscanPageTitle}"
-          sub-label="$i18n{displayOverscanPageText}" on-tap="onOverscanTap_">
+          sub-label="$i18n{displayOverscanPageText}" on-tap="onOverscanTap_"
+          hidden$="[[!showOverscanSetting_(selectedDisplay)]]">
       </button>
 
       <settings-display-overscan-dialog id="displayOverscan"

chrome/browser/resources/settings/device_page/display.js

@@ -285,6 +285,16 @@ Polymer({
         loadTimeData.getBoolean('enableTouchCalibrationSetting');
   },
 
+  /**
+   * Returns true if the overscan setting should be shown for |display|.
+   * @param {!chrome.system.display.DisplayUnitInfo} display
+   * @return {boolean}
+   * @private
+   */
+  showOverscanSetting_: function(display) {
+    return !display.isInternal;
+  },
+
   /**
    * @param {!Array<!chrome.system.display.DisplayUnitInfo>} displays
    * @return {boolean}