[DevTools] clean console on navigation as early as possible

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
index 606fd984d62372b5ac663166a2b884f39a4dc099..a6fea2b6de4ba42baa3005102a26978dd4291279 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
@@ -204,8 +204,6 @@ SDK.ResourceTreeModel = class extends SDK.SDKModel {
       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);
@@ -239,6 +237,21 @@ SDK.ResourceTreeModel = class extends SDK.SDKModel {
   }
 
   /**
+   * @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) {
@@ -788,6 +801,7 @@ SDK.PageDispatcher = class {
    * @param {!Protocol.Page.FrameId} frameId
    */
   frameStartedLoading(frameId) {
+    this._resourceTreeModel._frameStartedLoading(frameId);
   }
 
   /**