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

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

Index: third_party/WebKit/Source/platform/bindings/DOMWrapperWorld.cpp
diff --git a/third_party/WebKit/Source/platform/bindings/DOMWrapperWorld.cpp b/third_party/WebKit/Source/platform/bindings/DOMWrapperWorld.cpp
index 106f9d359a1550d98dddc8b8e51e0a908a22a18f..edcc075b19ea6b545bf4fc1e4cff091d270a0809 100644
--- a/third_party/WebKit/Source/platform/bindings/DOMWrapperWorld.cpp
+++ b/third_party/WebKit/Source/platform/bindings/DOMWrapperWorld.cpp
@@ -257,6 +257,7 @@ void DOMWrapperWorld::WeakCallbackForDOMObjectHolder(
   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>);
@@ -266,10 +267,7 @@ int DOMWrapperWorld::GenerateWorldIdForType(WorldType 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;
+      return GetNextDevToolsIsolatedWorldId();
     case WorldType::kGarbageCollector:
     case WorldType::kRegExp:
     case WorldType::kTesting:
@@ -283,6 +281,16 @@ int DOMWrapperWorld::GenerateWorldIdForType(WorldType world_type) {
   return kInvalidWorldId;
 }
 
+// static
+int DOMWrapperWorld::GetNextDevToolsIsolatedWorldId() {
+  DCHECK(IsMainThread());
+  static int next_devtools_isolated_world_id =
+      WorldId::kDevToolsFirstIsolatedWorldId;
+  if (next_devtools_isolated_world_id > WorldId::kDevToolsLastIsolatedWorldId)
+    return WorldId::kInvalidWorldId;
+  return next_devtools_isolated_world_id++;
+}
+
 void DOMWrapperWorld::DissociateDOMWindowWrappersInAllWorlds(
     ScriptWrappable* script_wrappable) {
   DCHECK(script_wrappable);