Add display scaling and rotation shortcuts to keyboard overlay.

chrome/browser/resources/chromeos/keyboard_overlay.js

Index: chrome/browser/resources/chromeos/keyboard_overlay.js
diff --git a/chrome/browser/resources/chromeos/keyboard_overlay.js b/chrome/browser/resources/chromeos/keyboard_overlay.js
index 4d68ac1b44acac56fb6b4882024817151f9ffecf..3fed9c8f64ba5e83e45e98d368985d3ff663b275 100644
--- a/chrome/browser/resources/chromeos/keyboard_overlay.js
+++ b/chrome/browser/resources/chromeos/keyboard_overlay.js
@@ -128,6 +128,19 @@ function getShortcutData() {
 
   shortcutDataCache = keyboardOverlayData['shortcut'];
 
+  if (!isDisplayRotationEnabled()) {
+    // Rotate screen
+    delete shortcutDataCache['reload<>CTRL<>SHIFT'];
+  }
+  if (!isDisplayUIScalingEnabled()) {
+    // Zoom screen in
+    delete shortcutDataCache['+<>CTRL<>SHIFT'];
+    // Zoom screen out
+    delete shortcutDataCache['-<>CTRL<>SHIFT'];
+    // Reset screen zoom
+    delete shortcutDataCache['0<>CTRL<>SHIFT'];
+  }
+
   // TODO(mazda): Clean this up and move these out to the data js.
   var searchModifierAddShortcuts = {
     '1<>SEARCH': 'keyboardOverlayF1',
@@ -603,8 +616,23 @@ function initLayout() {
  * @return {boolean} Returns true if the device has a diamond key.
  */
 function hasDiamondKey() {
-  return (loadTimeData.getString('keyboardOverlayHasChromeOSDiamondKey') ==
-          'true');
+  return loadTimeData.getBoolean('keyboardOverlayHasChromeOSDiamondKey');
+}
+
+/**
+ * Returns true if display rotation feature is enabled.
+ * @return {boolean} True if display rotation feature is enabled.
+ */
+function isDisplayRotationEnabled() {
+  return loadTimeData.getBoolean('keyboardOverlayIsDisplayRotationEnabled');
+}
+
+/**
+ * Returns true if display scaling feature is enabled.
+ * @return {boolean} True if display scaling feature is enabled.
+ */
+function isDisplayUIScalingEnabled() {
+  return loadTimeData.getBoolean('keyboardOverlayIsDisplayUIScalingEnabled');
 }
 
 /**