[DevTools] clean console on navigation as early as possible

third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 186 matching lines @@
 
     this._securityOriginManager.removeSecurityOrigin(frame.securityOrigin);
     frame._navigate(framePayload);
     var addedOrigin = frame.securityOrigin;
 
     this.dispatchEventToListeners(SDK.ResourceTreeModel.Events.FrameNavigated, frame);
     if (frame.isMainFrame()) {
       this.dispatchEventToListeners(SDK.ResourceTreeModel.Events.MainFrameNavigated, frame);
       if (Common.moduleSetting('preserveConsoleLog').get())
         Common.console.log(Common.UIString('Navigated to %s', frame.url));
-      else
-        this.target().consoleModel.clear();
     }
     if (addedOrigin)
       this._securityOriginManager.addSecurityOrigin(addedOrigin);
 
     // Fill frame with retained resources (the ones loaded using new loader).
     var resources = frame.resources();
     for (var i = 0; i < resources.length; ++i)
       this.dispatchEventToListeners(SDK.ResourceTreeModel.Events.ResourceAdded, resources[i]);
 
     if (frame.isMainFrame())
@@ skipping 13 matching lines @@
       return;
 
     this._securityOriginManager.removeSecurityOrigin(frame.securityOrigin);
     if (frame.parentFrame)
       frame.parentFrame._removeChildFrame(frame);
     else
       frame._remove();
   }
 
   /**
+   * @param {!Protocol.Page.FrameId} frameId
+   */
+  _frameStartedLoading(frameId) {
+    // Do nothing unless cached resource tree is processed - it will overwrite everything.
+    if (!this._cachedResourcesProcessed)
+      return;
+
+    var frame = this._frames.get(frameId);
+    if (frame && !frame.isMainFrame())
+      return;
+    if (!Common.moduleSetting('preserveConsoleLog').get())
+      this.target().consoleModel.clear();
+  }
+
+  /**
    * @param {!Common.Event} event
    */
   _onRequestFinished(event) {
     if (!this._cachedResourcesProcessed)
       return;
 
     var request = /** @type {!SDK.NetworkRequest} */ (event.data);
     if (request.failed || request.resourceType() === Common.resourceTypes.XHR)
       return;
 
@@ skipping 529 matching lines @@
    */
   frameDetached(frameId) {
     this._resourceTreeModel._frameDetached(frameId);
   }
 
   /**
    * @override
    * @param {!Protocol.Page.FrameId} frameId
    */
   frameStartedLoading(frameId) {
+    this._resourceTreeModel._frameStartedLoading(frameId);
   }
 
   /**
    * @override
    * @param {!Protocol.Page.FrameId} frameId
    */
   frameStoppedLoading(frameId) {
   }
 
   /**
@@ skipping 78 matching lines @@
     this._resourceTreeModel.dispatchEventToListeners(SDK.ResourceTreeModel.Events.InterstitialHidden);
   }
 
   /**
    * @override
    */
   navigationRequested() {
     // Frontend is not interested in when navigations are requested.
   }
 };