DevTools: Implement extension-based status bar buttons

Source/devtools/front_end/main/module.json

Index: Source/devtools/front_end/main/module.json
diff --git a/Source/devtools/front_end/main/module.json b/Source/devtools/front_end/main/module.json
index 601a442ac6362d3990e4a76a605ed281120d850b..6e82f0402b17a4f2d24f348cf71a61da74b596ee 100644
--- a/Source/devtools/front_end/main/module.json
+++ b/Source/devtools/front_end/main/module.json
@@ -1,6 +1,11 @@
 {
     "extensions": [
         {
+            "type": "@WebInspector.ContextMenu.Provider",
+            "contextTypes": ["WebInspector.UISourceCode", "WebInspector.Resource", "WebInspector.NetworkRequest", "Node"],
+            "className": "WebInspector.HandlerRegistry.ContextMenuProvider"
+        },
+        {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "main.reload",
             "className": "WebInspector.Main.ReloadActionDelegate",
@@ -111,6 +116,22 @@
             ]
         },
         {
+            "type": "@WebInspector.StatusBarButton.Provider",
+            "className": "WebInspector.InspectElementModeController.ToggleButtonProvider",
+            "location": "toolbar-left",
+            "actionId": "main.toggle-element-search"
+        },
+        {
+            "type": "@WebInspector.StatusBarButton.Provider",
+            "className": "WebInspector.AdvancedApp.ResponsiveDesignButtonProvider",
+            "location": "toolbar-left"
+        },
+        {
+            "type": "@WebInspector.StatusBarButton.Provider",
+            "className": "WebInspector.DockController.ButtonProvider",
+            "location": "toolbar-right"
+        },
+        {
             "type": "ui-setting",
             "title": "Disable cache (while DevTools is open)",
             "settingName": "cacheDisabled",