Anti-shelf-overlapping fixes for several menus.

chrome/browser/resources/chromeos/login/login_common.js

Index: chrome/browser/resources/chromeos/login/login_common.js
diff --git a/chrome/browser/resources/chromeos/login/login_common.js b/chrome/browser/resources/chromeos/login/login_common.js
index e1032bb06ed55945f31678410127353ec6c26231..8a5ec108719cc7304c0f7c50e9ebbde5fb1ec5d2 100644
--- a/chrome/browser/resources/chromeos/login/login_common.js
+++ b/chrome/browser/resources/chromeos/login/login_common.js
@@ -327,6 +327,19 @@ cr.define('cr.ui', function() {
     Oobe.getInstance().setClientAreaSize(width, height);
   };
 
+  /**
+   * Computes max-height for an element so that it doesn't overlap shelf.
+   * @param {element} DOM element
+   */
+  Oobe.getMaxHeightBeforeShelfOverlapping = function(element) {
+    var maxAllowedHeight =
+        $('outer-container').offsetHeight -
+        element.getBoundingClientRect().top -
+        parseInt(window.getComputedStyle(element).marginTop) -
+        parseInt(window.getComputedStyle(element).marginBottom);
+    return maxAllowedHeight;
+  };
+
   // Export
   return {
     Oobe: Oobe