WIP: Reland CompiledScript, prototype compiling in a separate task.

third_party/WebKit/Source/bindings/core/v8/ScriptController.h

Index: third_party/WebKit/Source/bindings/core/v8/ScriptController.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptController.h b/third_party/WebKit/Source/bindings/core/v8/ScriptController.h
index cd40a2315964bbd8b642d962b7d355c6de998ee4..f4c26a03b37d7cc57251074f4d411a1ee1b09695 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptController.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptController.h
@@ -47,6 +47,7 @@
 
 namespace blink {
 
+class CompiledScript;
 class DOMWrapperWorld;
 class Element;
 class KURL;
@@ -91,6 +92,12 @@ class CORE_EXPORT ScriptController final
       const ScriptSourceCode&,
       AccessControlStatus = NotSharableCrossOrigin);
 
+  // The same, but separated into two phases.
+  // compileScriptInMainWorld may return nullptr.
+  CompiledScript* compileScriptInMainWorld(const ScriptSourceCode&,
+                                           AccessControlStatus);
+  void executeScriptInMainWorld(const CompiledScript&);
+
   // Executes JavaScript in an isolated world. The script gets its own global
   // scope, its own prototypes for intrinsic JavaScript objects (String, Array,
   // and so-on), and its own wrappers for all DOM nodes and DOM constructors.