[DevTools]: Require explicit connection

third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js

Index: third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js b/third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js
index 0a2d8db714e87a240de52a7269e22306bad54b79..bc6842fa83bd8df061fb8d46a4e41c8f763e69da 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js
@@ -108,6 +108,7 @@ WebInspector.SourcesPanel = function()
     WebInspector.targetManager.addModelListener(WebInspector.DebuggerModel, WebInspector.DebuggerModel.Events.DebuggerPaused, this._debuggerPaused, this);
     WebInspector.targetManager.addModelListener(WebInspector.DebuggerModel, WebInspector.DebuggerModel.Events.DebuggerResumed, this._debuggerResumed, this);
     WebInspector.targetManager.addModelListener(WebInspector.DebuggerModel, WebInspector.DebuggerModel.Events.GlobalObjectCleared, this._debuggerReset, this);
+    WebInspector.targetManager.addModelListener(WebInspector.SubTargetsManager, WebInspector.SubTargetsManager.Events.SubTargetAdded, this._subTargetAdded, this);
     new WebInspector.WorkspaceMappingTip(this, this._workspace);
     WebInspector.extensionServer.addEventListener(WebInspector.ExtensionServer.Events.SidebarPaneAdded, this._extensionSidebarPaneAdded, this);
     WebInspector.DataSaverInfobar.maybeShowInPanel(this);
@@ -125,13 +126,7 @@ WebInspector.SourcesPanel.prototype = {
      */
     targetAdded: function(target)
     {
-        var hasThreads = WebInspector.targetManager.targets(WebInspector.Target.Capability.JS).length > 1;
-        if (hasThreads && !this._threadsSidebarPane) {
-            this._threadsSidebarPane = /** @type {!WebInspector.View} */ (WebInspector.viewManager.view("sources.threads"));
-            if (this._sidebarPaneStack) {
-                this._sidebarPaneStack.showView(this._threadsSidebarPane, this._splitWidget.isVertical() ? this._watchSidebarPane : this._callstackPane);
-            }
-        }
+        this._showThreadsIfNeeded();
     },
 
     /**
@@ -142,6 +137,21 @@ WebInspector.SourcesPanel.prototype = {
     {
     },
 
+    _subTargetAdded: function()
+    {
+        this._showThreadsIfNeeded();
+    },
+
+    _showThreadsIfNeeded: function()
+    {
+        if (WebInspector.ThreadsSidebarPane.isShown() && !this._threadsSidebarPane) {
+            this._threadsSidebarPane = /** @type {!WebInspector.View} */ (WebInspector.viewManager.view("sources.threads"));
+            if (this._sidebarPaneStack) {
+                this._sidebarPaneStack.showView(this._threadsSidebarPane, this._splitWidget.isVertical() ? this._watchSidebarPane : this._callstackPane);
+            }
+        }
+    },
+
     /**
      * @param {?WebInspector.Target} target
      */