DevTools: Add the command menu to the main menu

Change-Id: Ib45039f33313e2fe950967d6ad2b9d2ee956bf81
Reviewed-on: https://chromium-review.googlesource.com/1199966Reviewed-by: Erik Luo <luoe@chromium.org>
Commit-Queue: Joel Einbinder <einbinder@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589453}

third_party/blink/renderer/devtools/front_end/quick_open/module.json

@@ -14,6 +14,7 @@
         {
             "type": "action",
             "actionId": "commandMenu.show",
+            "title": "Run command",
             "className": "QuickOpen.CommandMenu.ShowActionDelegate",
             "bindings": [
                 {
@@ -26,6 +27,11 @@
                 }
             ]
         },
+        {
+            "type": "context-menu-item",
+            "location": "mainMenu/default",
+            "actionId": "commandMenu.show"
+        },
         {
             "type": "action",
             "actionId": "quickOpen.show",