DevTools: [Persistence] sync resetting of working copy

third_party/WebKit/Source/devtools/front_end/persistence/Persistence.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 Persistence.Persistence = class extends Common.Object {
   /**
    * @param {!Workspace.Workspace} workspace
    * @param {!Bindings.BreakpointManager} breakpointManager
@@ skipping 117 matching lines @@
 
   /**
    * @param {!Common.Event} event
    */
   _onWorkingCopyChanged(event) {
     var uiSourceCode = /** @type {!Workspace.UISourceCode} */ (event.data);
     var binding = uiSourceCode[Persistence.Persistence._binding];
     if (!binding || binding[Persistence.Persistence._muteWorkingCopy])
       return;
     var other = binding.network === uiSourceCode ? binding.fileSystem : binding.network;
+    if (!uiSourceCode.isDirty()) {
+      binding[Persistence.Persistence._muteWorkingCopy] = true;
+      other.resetWorkingCopy();
+      binding[Persistence.Persistence._muteWorkingCopy] = false;
+      this._contentSyncedForTest();
+      return;
+    }
+
     var target = Bindings.NetworkProject.targetForUISourceCode(binding.network);
     if (target.isNodeJS()) {
       var newContent = uiSourceCode.workingCopy();
       other.requestContent().then(() => {
         var nodeJSContent =
             Persistence.Persistence._rewrapNodeJSContent(binding, other, other.workingCopy(), newContent);
         setWorkingCopy.call(this, () => nodeJSContent);
       });
       return;
     }
@@ skipping 186 matching lines @@
   constructor(network, fileSystem, exactMatch) {
     this.network = network;
     this.fileSystem = fileSystem;
     this.exactMatch = exactMatch;
     this._removed = false;
   }
 };
 
 /** @type {!Persistence.Persistence} */
 Persistence.persistence;