DevTools: allow reattaching main target live.

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
index 39c039703e2b9a2a135a39253a766bcf76e65f74..06736ed6fe73e46542367db6bfe195f9306a81a5 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
@@ -235,6 +235,32 @@ WebInspector.TargetManager.prototype = {
     },
 
     /**
+     * @param {function()} factory
+     */
+    setMainTargetFactory: function(factory)
+    {
+        this._mainTargetFactory = factory;
+    },
+
+    /**
+     * @param {function(string)} dispatch
+     * @return {!Promise<!WebInspector.RawProtocolConnection>}
+     */
+    interceptMainConnection: function(dispatch)

[dgozman, 2016/10/15 00:26:26]

Let's rework TargetDisposed event.

+    {
+        var targets = this._targets.slice();
+        for (var i = targets.length - 1; i >=0 ; --i)
+            targets[i].connection().close();
+
+        var yeld = InspectorFrontendHost.reattach.bind(InspectorFrontendHost, this._mainTargetFactory);

[dgozman, 2016/10/15 00:26:26]

yield

+
+        var fulfill;
+        var result = new Promise(resolve => fulfill = resolve);
+        InspectorFrontendHost.reattach(() => fulfill(new WebInspector.RawProtocolConnection(dispatch, yeld)));
+        return result;
+    },
+
+    /**
      * @param {!WebInspector.Target} target
      * @return {!Array<!WebInspector.TargetManager.Observer>}
      */
@@ -288,6 +314,8 @@ WebInspector.TargetManager.prototype = {
      */
     removeTarget: function(target)
     {
+        if (!this._targets.includes(target))

[dgozman, 2016/10/15 00:26:26]

Let's try to only remove main.

+            return;
         this._targets.remove(target);
         var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
         var treeModelListeners = resourceTreeModel && resourceTreeModel[WebInspector.TargetManager._listenersSymbol];