DevTools: Implement extension-based status bar buttons

Source/devtools/front_end/components/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.ContextMenu.Provider",
             "contextTypes": ["WebInspector.UISourceCode", "WebInspector.Resource", "WebInspector.NetworkRequest", "Node"],
             "className": "WebInspector.HandlerRegistry.ContextMenuProvider"
+        },
+        {
+            "type": "@WebInspector.ActionDelegate",
+            "actionId": "main.toggle-element-search",
+            "className": "WebInspector.InspectElementModeController.ToggleSearchActionDelegate",
+            "bindings": [
+                {
+                    "platform": "windows,linux",
+                    "shortcut": "Ctrl+Shift+C"
+                },
+                {
+                    "platform": "mac",
+                    "shortcut": "Meta+Shift+C"
+                }
+            ]
+        },
+        {
+            "type": "@WebInspector.StatusBarButton.Provider",
+            "className": "WebInspector.InspectElementModeController.ToggleButtonProvider",
+            "location": "toolbar-left",
+            "actionId": "main.toggle-element-search"
+        },
+        {
+            "type": "@WebInspector.StatusBarButton.Provider",
+            "className": "WebInspector.DockController.ButtonProvider",
+            "location": "toolbar-right"
         }
     ]
 }