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

third_party/WebKit/Source/platform/bindings/DOMWrapperWorld.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 239 matching lines @@
   DCHECK(dom_object_holders_.Contains(holder_base));
   dom_object_holders_.erase(holder_base);
 }
 
 void DOMWrapperWorld::WeakCallbackForDOMObjectHolder(
     const v8::WeakCallbackInfo<DOMObjectHolderBase>& data) {
   DOMObjectHolderBase* holder_base = data.GetParameter();
   holder_base->World()->UnregisterDOMObjectHolder(holder_base);
 }
 
+// static
 int DOMWrapperWorld::GenerateWorldIdForType(WorldType world_type) {
   DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<int>, next_world_id,
                                   new ThreadSpecific<int>);
   if (!next_world_id.IsSet())
     *next_world_id = WorldId::kUnspecifiedWorldIdStart;
   switch (world_type) {
     case WorldType::kMain:
       return kMainWorldId;
     case WorldType::kIsolated:
       // This function should not be called for IsolatedWorld because an
       // identifier for the world is given from out of DOMWrapperWorld.
       NOTREACHED();
       return kInvalidWorldId;
     case WorldType::kGarbageCollector:
     case WorldType::kRegExp:
     case WorldType::kTesting:
     case WorldType::kWorker:
       int world_id = *next_world_id;
       CHECK_GE(world_id, WorldId::kUnspecifiedWorldIdStart);
       *next_world_id = world_id + 1;
       return world_id;
   }
   NOTREACHED();
   return kInvalidWorldId;
 }
 
+// static
+int DOMWrapperWorld::GetNextDevToolsIsolatedWorldId() {
+  DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<int>,

[pfeldman, 2017/05/05 15:40:24]

DCHECK(isMainThread()) + simpler static local instead?

[alex clarke (OOO till 29th), 2017/05/05 19:29:44]

Done.

+                                  next_devtools_isolated_world_id,
+                                  new ThreadSpecific<int>);
+
+  if (!next_devtools_isolated_world_id.IsSet())
+    *next_devtools_isolated_world_id = WorldId::kDevToolsFirstIsolatedWorldId;
+  int world_id = *next_devtools_isolated_world_id;
+  if (world_id > WorldId::kDevToolsLastIsolatedWorldId)
+    return WorldId::kInvalidWorldId;
+  *next_devtools_isolated_world_id = world_id + 1;
+  return world_id;
+}
+
 void DOMWrapperWorld::DissociateDOMWindowWrappersInAllWorlds(
     ScriptWrappable* script_wrappable) {
   DCHECK(script_wrappable);
   DCHECK(IsMainThread());
 
   script_wrappable->UnsetWrapperIfAny();
 
   for (auto& world : GetWorldMap().Values())
     world->DomDataStore().UnsetWrapperIfAny(script_wrappable);
 }
 
 }  // namespace blink