WebUI: Fix cr-input to work with Polymer 2.

In Polymer 2 the following syntax for registering event listeners
is no longer supported.

listeners: {
  'id.eventName': 'onEventName_',
},

Instead the listener must be added either programmatically, or
declaratively directly on the |id| element.

Bug:875470

Change-Id: I84f1d61b9b669dda1922f6c8d5f2bbc8de211c1c
Reviewed-on: https://chromium-review.googlesource.com/1213380Reviewed-by: Esmael El-Moslimany <aee@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589732}

testing/buildbot/filters/webui_polymer2_interactive_ui_tests.filter

@@ -18,5 +18,4 @@ SettingsUIBrowserTest.All
 
 # TODO(dpapad): The following tests are failing with optimize_webui=true. Fix
 # them and move them to the list above.
--CrElementsInputTest.All
 -MaterialBookmarksFocusTest.All

ui/webui/resources/cr_elements/cr_input/cr_input.html

@@ -108,7 +108,9 @@
             readonly$="[[readonly]]" maxlength$="[[maxlength]]"
             pattern="[[pattern]]" required="[[required]]"
             incremental="[[incremental]]" minlength$="[[minlength]]"
-            max="[[max]]" min="[[min]]">
+            max="[[max]]" min="[[min]]" on-focus="onInputFocus_"
+            on-blur="onInputBlur_" on-change="onInputChange_"
+            on-keydown="onInputKeydown_">
         <div id="underline"></div>
       </div>
       <slot name="suffix"></slot>

ui/webui/resources/cr_elements/cr_input/cr_input.js

@@ -150,10 +150,6 @@ Polymer({
   },
 
   listeners: {
-    'input.focus': 'onInputFocus_',
-    'input.blur': 'onInputBlur_',
-    'input.change': 'onInputChange_',
-    'input.keydown': 'onInputKeydown_',
     'focus': 'focusInput_',
     'pointerdown': 'onPointerDown_',
   },
@@ -328,4 +324,4 @@ Polymer({
     this.invalid = !this.inputElement.checkValidity();
     return !this.invalid;
   },
-});
+});
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