DevTools: migrate sources panel sidebar to views.

third_party/WebKit/Source/devtools/front_end/ui/View.js

Index: third_party/WebKit/Source/devtools/front_end/ui/View.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/View.js b/third_party/WebKit/Source/devtools/front_end/ui/View.js
index 5b866d8d444c30a7234c1ea124471a82210ca52c..f8639361cc8017a3c55dde79370b85710b95dc20 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/View.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/View.js
@@ -303,12 +303,14 @@ WebInspector.ViewManager = function()
 WebInspector.ViewManager.prototype = {
     /**
      * @param {!WebInspector.Widget} widget
+     * @return {!Promise}
      */
     revealViewWithWidget: function(widget)
     {
         var view = widget[WebInspector.View._symbol];
         if (view)
-            this.revealView(view);
+            return this.revealView(view);
+        return Promise.resolve();
     },
 
     /**
@@ -326,6 +328,15 @@ WebInspector.ViewManager.prototype = {
 
     /**
      * @param {string} viewId
+     * @return {?WebInspector.View}
+     */
+    view: function(viewId)
+    {
+        return this._views.get(viewId);
+    },
+
+    /**
+     * @param {string} viewId
      * @return {!Promise}
      */
     showView: function(viewId)
@@ -341,7 +352,7 @@ WebInspector.ViewManager.prototype = {
 
         return this._resolveLocation(locationName).then(location => {
             if (!location)
-                return;
+                throw new Error("Could not resolve location for view: " + viewId);
             location._reveal();
             return location.showView(view);
         });