Add a DevTools command to create an isolated world for a given frame

third_party/WebKit/Source/core/inspector/browser_protocol.json

 {
     "version": { "major": "1", "minor": "2" },
     "domains": [{
         "domain": "Inspector",
         "experimental": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 489 matching lines @@
             },
             {
                 "name": "getLayoutMetrics",
                 "description": "Returns metrics relating to the layouting of the page, such as viewport bounds/scale.",
                 "experimental": true,
                 "returns": [
                     { "name": "layoutViewport", "$ref": "LayoutViewport", "description": "Metrics relating to the layout viewport." },
                     { "name": "visualViewport", "$ref": "VisualViewport", "description": "Metrics relating to the visual viewport." },
                     { "name": "contentSize", "$ref": "DOM.Rect", "description": "Size of scrollable area."}
                 ]
+            },
+            {
+                "name": "ensureIsolatedWorld",
+                "description": "Ensures an isolated world for the given frame exists,",
+                "experimental": true,
+                "parameters": [
+                    { "name": "frameId", "$ref": "FrameId", "description": "Id of the frame in which the isolated world should be created." },
+                    { "name": "worldId", "type": "integer", "description": "Id of the isolated world. Must be >= 1 and < 1<<29." },

[pfeldman, 2017/04/27 19:25:42]

I'd rather return the worldId.

[Sami, 2017/04/28 10:12:57]

Yeah, that would make it easier for clients to create multiple worlds without
having well known ids. I guess this then becomes createIsolatedWorld.

[alex clarke (OOO till 29th), 2017/04/28 21:18:43]

Done.

+                    { "name": "securityOrigin", "type": "string", "optional": true, "description": "Associates the isolated world with a particular security origin." },

[pfeldman, 2017/04/27 19:25:42]

When is it is different from frame?

[Sami, 2017/04/28 10:12:57]

Discussed offline that we probably want a bool instead: grantUniversalAccess.

[alex clarke (OOO till 29th), 2017/04/28 21:18:43]

Done.

+                    { "name": "contentSecurityPolicy", "type": "string", "optional": true, "description": "Associates the isolated world with a particular Content Security Policy." }
+                ]
             }
         ],
         "events": [
             {
                 "name": "domContentEventFired",
                 "parameters": [
                     { "name": "timestamp", "type": "number" }
                 ]
             },
             {
@@ skipping 4129 matching lines @@
                 "parameters": [
                     { "name": "windowId", "$ref": "WindowID", "description": "Browser window id." }
                 ],
                 "returns": [
                     { "name": "bounds", "$ref": "Bounds", "description": "Bounds information of the window. When window state is 'minimized', the restored window position and size are returned." }
                 ]
             }
         ]
     }]
 }