MD Settings: adjust dialog style and scroll border visual

chrome/browser/resources/settings/printing_page/cups_add_printer_dialog.html

 <link rel="import" href="chrome://resources/html/md_select_css.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="cups_add_printer_dialog_util.html">
 <link rel="import" href="cups_printers_browser_proxy.html">
 <link rel="import" href="../settings_shared_css.html">
@@ skipping 23 matching lines @@
       }
 
       #searchSpinner paper-spinner {
         --paper-spinner-stroke-width: 2px;
         -webkit-margin-end: 3px;
         -webkit-margin-start: 20px;
         height: 15px;
         width: 15px;
       }
 
-      #manuallyAddPrinterButton {
-        -webkit-margin-end: 210px;
+      .dialog-buttons {
+        display: flex;
+        justify-content: space-between;
+        width: 100%;
       }
     </style>
     <add-printer-dialog>
       <div class="dialog-title">$i18n{addPrintersNearbyTitle}</div>
       <div class="dialog-body">
         <add-printer-list printers="[[discoveredPrinters]]"
             selected-printer="{{selectedPrinter}}">
         </add-printer-list>
         <div class="center" id="noPrinterMessage" hidden>
            $i18n{noPrinterNearbyMessage}
         </div>
         <div id="searchSpinner" hidden="[[!discovering_]]">
           <paper-spinner active="[[discovering_]]"></paper-spinner>
           <span>$i18n{searchingNearbyPrinters}</span>
         </div>
       </div>
       <div class="dialog-buttons">
-        <paper-button id="manuallyAddPrinterButton"
-            on-tap="switchToManualAddDialog_">
-          $i18n{manuallyAddPrinterButtonText}
-        </paper-button>
-        <paper-button class="cancel-button" on-tap="onCancelTap_">
-          $i18n{cancelButtonText}
-        </paper-button>
-        <paper-button class="action-button" id="addPrinterButton"
-            disabled="[[!selectedPrinter]]" on-tap="switchToConfiguringDialog_">
-          $i18n{addPrinterButtonText}
-        </paper-button>
+        <div>  <!-- Left group -->
+          <paper-button id="manuallyAddPrinterButton" class="secondary-button"
+              on-tap="switchToManualAddDialog_">
+            $i18n{manuallyAddPrinterButtonText}
+          </paper-button>
+        </div>
+        <div>  <!-- Right group -->
+          <paper-button class="cancel-button secondary-button"
+              on-tap="onCancelTap_">
+            $i18n{cancelButtonText}
+          </paper-button>
+          <paper-button class="action-button" id="addPrinterButton"
+              disabled="[[!selectedPrinter]]"
+              on-tap="switchToConfiguringDialog_">
+            $i18n{addPrinterButtonText}
+          </paper-button>
+        </div>
       </div>
     </add-printer-dialog>
   </template>
 </dom-module>
 
 <dom-module id="add-printer-manually-dialog">
   <template>
     <style include="settings-shared md-select">
       #discoverPrintersButton {
         -webkit-margin-end: 153px;
@@ skipping 110 matching lines @@
         </div>
         <div class="search-printer-box printer-not-found"
             id="searchNotFound" hidden>
           <span>$i18n{printerNotFound}</span>
         </div>
         <div class="search-printer-box printer-found" id="searchFound" hidden>
           <span>$i18n{printerFound}</span>
         </div>
       </div>
       <div class="dialog-buttons">
-        <paper-button class="cancel-button" on-tap="onCancelTap_">
+        <paper-button class="cancel-button secondary-button"
+            on-tap="onCancelTap_">
           $i18n{cancelButtonText}
         </paper-button>
         <paper-button class="action-button" on-tap="switchToManufacturerDialog_"
             disabled="[[!newPrinter.printerName]]">
           $i18n{addPrinterButtonText}
         </paper-button>
       </div>
     </add-printer-dialog>
   </template>
 </dom-module>
@@ skipping 29 matching lines @@
         width: 340px;
       }
 
       .error-message {
         background-color: var(--google-red-100);
         color: red;
         margin-top: 10px;
         padding: 10px 20px;
       }
 
-      #manuallyAddPrinterButton {
-        -webkit-margin-end: 210px;
+      .dialog-buttons {
+        display: flex;
+        justify-content: space-between;
+        width: 100%;
       }
 
       #browseButton {
         color: black;
         font-size: inherit;
       }
     </style>
     <add-printer-dialog>
       <div class="dialog-title">$i18n{addPrintersManuallyTitle}</div>
       <div class="dialog-body">
@@ skipping 30 matching lines @@
                 </paper-button>
               </paper-input>
             </div>
           </div>
         </div>
         <div class="error-message" hidden="[[!setupFailed]]">
           Driver not found (exact error message TBD)
         </div>
       </div>
       <div class="dialog-buttons">
-        <paper-button id="manuallyAddPrinterButton"
-            on-tap="switchToManualAddDialog_">
-          $i18n{manuallyAddPrinterButtonText}
-        </paper-button>
-        <paper-button class="cancel-button" on-tap="onCancelTap_">
-          $i18n{cancelButtonText}
-        </paper-button>
-        <paper-button class="action-button" id="addPrinterButton"
-            on-tap="switchToConfiguringDialog_">
-          $i18n{addPrinterButtonText}
-        </paper-button>
+        <div>  <!-- Left group -->
+          <paper-button id="manuallyAddPrinterButton" class="secondary-button"
+              on-tap="switchToManualAddDialog_">
+            $i18n{manuallyAddPrinterButtonText}
+          </paper-button>
+        </div>
+        <div>  <!-- Right group -->
+          <paper-button class="cancel-button secondary-button"
+              on-tap="onCancelTap_">
+            $i18n{cancelButtonText}
+          </paper-button>
+          <paper-button class="action-button" id="addPrinterButton"
+              on-tap="switchToConfiguringDialog_">
+            $i18n{addPrinterButtonText}
+          </paper-button>
+        </div>
       </div>
     </add-printer-dialog>
   </template>
 </dom-module>
 
 <dom-module id="add-printer-configuring-dialog">
   <template>
     <style include="settings-shared">
       .dialog-body {
         padding-top: 140px;
         text-align: center;
       }
     </style>
     <add-printer-dialog>
       <div class="dialog-title">[[dialogTitle]]</div>
       <div class="dialog-body">
         <paper-spinner active></paper-spinner>
         <div id="configuringMessage">$i18n{printerConfiguringMessage}</div>
       </div>
       <div class="dialog-buttons">
-        <paper-button class="cancel-button" on-tap="onCancelConfiguringTap_">
+        <paper-button class="cancel-button secondary-button"
+            on-tap="onCancelConfiguringTap_">
           $i18n{cancelButtonText}
         </paper-button>
       </div>
     </add-printer-dialog>
   </template>
 </dom-module>
 
 <dom-module id="settings-cups-add-printer-dialog">
   <template>
     <style include="settings-shared"></style>
@@ skipping 21 matching lines @@
     <!-- Manufacturer and Model Dialog -->
     <template is="dom-if" if="[[showManufacturerDialog_]]" restamp>
       <add-printer-manufacturer-model-dialog new-printer="{{newPrinter}}"
           setup-failed="[[setupFailed]]">
       </add-printer-manufacturer-model-dialog>
     </template>
 
   </template>
   <script src="cups_add_printer_dialog.js"></script>
 </dom-module>