DevTools: revert to last committed live expression on escape

Bug: none
Change-Id: I6e206b63e45e8b6e4510125195aa1169223d5d1e
Reviewed-on: https://chromium-review.googlesource.com/1220550
Reviewed-by: Joel Einbinder <einbinder@chromium.org>
Commit-Queue: Erik Luo <luoe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592664}

third_party/blink/renderer/devtools/front_end/console/ConsolePinPane.js

@@ -129,8 +129,12 @@ Console.ConsolePin = class extends Common.Object {
       this._editor.widget().element.tabIndex = -1;
       this._editor.setText(expression);
       this._editor.widget().element.addEventListener('keydown', event => {
-        if (event.key === 'Tab' && !this._editor.text())
+        if (event.key === 'Tab' && !this._editor.text()) {
           event.consume();
+          return;
+        }
+        if (event.keyCode === UI.KeyboardShortcut.Keys.Esc.code)
+          this._editor.setText(this._committedExpression);
       }, true);
       this._editor.widget().element.addEventListener('focusout', event => {
         const text = this._editor.text();

third_party/blink/renderer/devtools/front_end/console/ConsoleView.js

@@ -163,8 +163,11 @@ Console.ConsoleView = class extends UI.VBox {
       this._pinPane.element.classList.add('console-view-pinpane');
       this._pinPane.show(this._contentsElement);
       this._pinPane.element.addEventListener('keydown', event => {
-        if (event.key === 'Enter' && event.ctrlKey)
+        if ((event.key === 'Enter' && UI.KeyboardShortcut.eventHasCtrlOrMeta(/** @type {!KeyboardEvent} */ (event))) ||
+            event.keyCode === UI.KeyboardShortcut.Keys.Esc.code) {
           this._prompt.focus();
+          event.consume();
+        }
       });
     }