MD Settings: Remove subpage animation when landing directly on it.

chrome/browser/resources/settings/settings_page/settings_section.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * 'settings-section' shows a paper material themed section with a header
  * which shows its page title.
  *
  * The section can expand vertically to fill its container's padding edge.
@@ skipping 81 matching lines @@
 
   /**
    * @return {boolean} True if the section is currently rendered and not
    *     already expanded or transitioning.
    */
   canAnimateExpand: function() {
     return !this.classList.contains('expanding') &&
         !this.classList.contains('expanded') && this.$.card.clientHeight > 0;
   },
 
+  immediateExpand: function(container) {
+    // Target position is the container's top edge in the viewport.
+    var containerTop = container.getBoundingClientRect().top;
+
+    this.$.card.position = 'fixed';
+    this.$.card.top = containerTop + 'px';
+    this.$.card.height = 'calc(100% - ' + containerTop + 'px)';
+
+    this.classList.add('expanded');
+  },
+
   /**
    * Animates the section expanding to fill the container. The section is fixed
    * in the viewport during the animation, making it safe to adjust the rest of
    * the DOM after calling this. The section adds the "expanding" class while
    * the animation plays and "expanded" after it finishes.
    *
    * @param {!HTMLElement} container The scrolling container to fill.
    * @return {!settings.animation.Animation}
    */
   animateExpand: function(container) {
@@ skipping 134 matching lines @@
 
     var options = /** @type {!KeyframeEffectOptions} */({
       duration: settings.animation.Timing.DURATION,
       easing: settings.animation.Timing.EASING,
     });
 
     return new settings.animation.Animation(
         this.$.card, [startFrame, endFrame], options);
   },
 });