Prevent user from saving invalid printer edit

-Same change as
 https://chromium-review.googlesource.com/c/chromium/src/+/1880181
 In original CL we missed fixing edit printer dialog
 as well.

Bug: 950887
Change-Id: I55c4e9cb3fa9c99bc104c660fdc0e555ecf8e860
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912648
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714789}

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

@@ -106,7 +106,8 @@
                 id="printerPPDManufacturer"
                 label="$i18n{printerManufacturer}"
                 value="{{pendingPrinter_.ppdManufacturer}}"
-                readonly="[[!isOnline_]]">
+                readonly="[[!isOnline_]]"
+                invalid="{{isManufacturerInvalid_}}">
             </cr-searchable-drop-down>
           </div>
           <div class="settings-box two-line">
@@ -114,7 +115,8 @@
                 id="printerPPDModel"
                 label="$i18n{printerModel}"
                 value="{{pendingPrinter_.ppdModel}}"
-                readonly="[[!isOnline_]]">
+                readonly="[[!isOnline_]]"
+                invalid="{{isModelInvalid_}}">
             </cr-searchable-drop-down>
           </div>
           <div id="ppdLabel" class="cr-form-field-label">
@@ -145,8 +147,8 @@
           $i18n{cancel}
         </cr-button>
         <cr-button class="action-button" on-click="onSaveTap_"
-            disabled="[[!canSavePrinter_(pendingPrinter_.*,
-                printerInfoChanged_, isOnline_)]]">
+            disabled="[[!canSavePrinter_(pendingPrinter_.*, printerInfoChanged_,
+               isOnline_, isManufacturerInvalid_, isModelInvalid_)]]">
           $i18n{editPrinterButtonText}
         </cr-button>
       </div>

chrome/browser/resources/settings/printing_page/cups_edit_printer_dialog.js

@@ -117,6 +117,26 @@ Polymer({
       type: String,
       value: '',
     },
+
+    /**
+     * Indicates whether the value in the Manufacturer dropdown is a valid
+     * printer manufacturer.
+     * @private
+     */
+    isManufacturerInvalid_: {
+      type: Boolean,
+      value: false,
+    },
+
+    /**
+     * Indicates whether the value in the Model dropdown is a valid printer
+     * model.
+     * @private
+     */
+    isModelInvalid_: {
+      type: Boolean,
+      value: false,
+    },
   },
 
   observers: [
@@ -303,7 +323,8 @@ Polymer({
    */
   canSavePrinter_: function() {
     return this.printerInfoChanged_ &&
-        (this.isPrinterConfigured_() || !this.isOnline_);
+        (this.isPrinterConfigured_() || !this.isOnline_) &&
+        !this.isManufacturerInvalid_ && !this.isModelInvalid_;
   },
 
   /**