MD Settings: settings-subpage-search, add text ellipsis for placeholder text.

chrome/browser/resources/settings/settings_page/settings_subpage_search.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <link rel="import" href="chrome://resources/cr_elements/cr_search_field/cr_search_field_behavior.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input-container.html">
 
 <dom-module id="settings-subpage-search">
@@ skipping 28 matching lines @@
       paper-input-container {
         display: inline-block;
         vertical-align: middle;
         width: 160px;  /* Special width for search input. */
       }
 
       input[type='search']::-webkit-search-cancel-button {
         -webkit-appearance: none;
       }
 
+      input[placeholder] {
+        text-overflow: ellipsis;
+      }
+
       #searchInput {
         font-size: 92.3076923%;  /* To 12px from 13px. */
         min-height: 24px;
       }
 
       #searchInput {
         color: var(--paper-grey-800);
       }
 
       #clearSearch {
@@ skipping 12 matching lines @@
           on-input="onSearchTermInput" aria-labelledby="prompt" incremental
           autofocus$="[[autofocus]]" placeholder="[[label]]">
       <button suffix is="paper-icon-button-light" id="clearSearch"
           class="icon-cancel" on-tap="onTapClear_" title="[[clearLabel]]"
           hidden$="[[!hasSearchText]]">
       </button>
     </paper-input-container>
   </template>
   <script src="settings_subpage_search.js"></script>
 </dom-module>