Revert of Switch RemoteWindowProxy to use v8::Context::NewRemoteContext.

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

Index: third_party/WebKit/Source/bindings/core/v8/WindowProxy.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.h b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.h
index 294d7eb48d68f4a886844a5b2094104c7d9f72d9..9089f013b83894a81d2d280d5737db54716a7745 100644
--- a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.h
+++ b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.h
@@ -31,125 +31,35 @@
 #ifndef WindowProxy_h
 #define WindowProxy_h
 
-#include <v8.h>
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ScopedPersistent.h"
-#include "core/CoreExport.h"
+#include "bindings/core/v8/ScriptState.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefPtr.h"
+#include <v8.h>
 
 namespace blink {
 
 class Frame;
+class ScriptController;
 
-// WindowProxy implements the split window model of a window for a frame. In the
-// HTML standard, the split window model is composed of the Window interface
-// (the inner global object) and the WindowProxy interface (the outer global
-// proxy).
-//
-// The Window interface is backed by the Blink DOMWindow C++ implementation.
-// In contrast, the WindowProxy interface does not have a corresponding
-// C++ implementation in Blink: the WindowProxy class defined here only manages
-// context initialization and detach. Instead, the behavior of the WindowProxy
-// interface is defined by JSGlobalProxy in v8 and the prototype chain set up
-// during context initialization.
-//
-// ====== Inner Global Object ======
-// The inner global object is the global for the script environment of a Frame.
-// Since Window and Document also have a 1:1 relationship, this means that each
-// inner global object has an associated Document which does not change. On
-// navigation, the new Document receives a new inner global object.
-//
-// However, there is one exception to the 1:1 DOMWindow:Document rule. If:
-// - the previous Document is the initial empty document
-// - the new Document is same-origin to the previous Document
-// then the inner global object will be reused for the new Document. This is the
-// only case where the associated Document of an inner global object can change.
-//
-// All methods and attributes defined on the Window interface are exposed via
-// the inner global object. Global variables defined by script running in the
-// Document also live on the inner global object.
-//
-// ====== Outer Global Proxy ====
-// The outer global proxy is reused across navigations. It implements the
-// security checks for same-origin/cross-origin access to the Window interface.
-// When the check passes (i.e. the access is same-origin), the access is
-// forwarded to the inner global object of the active Document in this
-// WindowProxy's Frame).
-//
-// When the security check fails, the access is delegated to the outer global
-// proxy's cross-origin interceptors. The cross-origin interceptors may choose
-// to return a value (if the property is exposed cross-origin) or throw an
-// exception otherwise.
-//
-// Note that the cross-origin interceptors are only used for cross-origin
-// accesses: a same-origin access to a method that is available cross-origin,
-// such as Window.postMessage, will be delegated to the inner global object.
-//
-// ====== LocalWindowProxy vs RemoteWindowProxy ======
-// WindowProxy has two concrete subclasses:
-// - LocalWindowProxy: implements the split window model for a frame in the same
-//   process, i.e. a LocalFrame.
-// - RemoteWindowProxy: implements the split window model for a frame in a
-//   different process, i.e. a RemoteFrame.
-//
-// While having a RemoteFrame implies the frame must be cross-origin, the
-// opposite is not true: a LocalFrame can be same-origin or cross-origin. One
-// additional complexity (which slightly violates the HTML standard): it is
-// possible to have SecurityOrigin::canAccess() return true for a RemoteFrame's
-// security origin; however, it is important to still deny access as if the
-// frame were cross-origin. This is due to complexities in the process
-// allocation model for renderer processes. See https://crbug.com/601629.
-//
-// ====== LocalWindowProxy ======
-// Since a LocalWindowProxy can represent a same-origin or cross-origin frame,
-// the entire prototype chain must be available:
-//
-//   outer global proxy
-//     -- has prototype --> inner global object
-//     -- has prototype --> Window.prototype
-//     -- has prototype --> WindowProperties [1]
-//     -- has prototype --> EventTarget.prototype
-//     -- has prototype --> Object.prototype
-//     -- has prototype --> null
-//
-// [1] WindowProperties is the named properties object of the Window interface.
-//
-// ====== RemoteWindowProxy ======
-// Since a RemoteWindowProxy only represents a cross-origin frame, it has a much
-// simpler prototype chain.
-//
-//   outer global proxy
-//     -- has prototype --> inner global object
-//     -- has prototype --> null
-//
-// Property access to get/set attributes and methods on the outer global proxy
-// are redirected through the cross-origin interceptors, since any access will
-// fail the security check, by definition.
-//
-// However, note that method invocations still use the inner global object as
-// the receiver object. Blink bindings use v8::Signature to perform a strict
-// receiver check, which requires that the FunctionTemplate used to instantiate
-// the receiver object matches exactly. However, when creating a new context,
-// only inner global object is instantiated using Blink's global template, so by
-// definition, it is the only receiver object in the prototype chain that will
-// match.
-//
-// ====== References ======
-// https://wiki.mozilla.org/Gecko:SplitWindow
-// https://whatwg.org/C/browsers.html#the-windowproxy-exotic-object
+// WindowProxy represents all the per-global object state for a Frame that
+// persist between navigations.
 class WindowProxy : public GarbageCollectedFinalized<WindowProxy> {
  public:
   virtual ~WindowProxy();
 
   DECLARE_TRACE();
 
+  v8::Local<v8::Context> contextIfInitialized() const {
+    return m_scriptState ? m_scriptState->context() : v8::Local<v8::Context>();
+  }
   void initializeIfNeeded();
 
   void clearForClose();
   void clearForNavigation();
 
-  CORE_EXPORT v8::Local<v8::Object> globalIfNotDetached();
+  v8::Local<v8::Object> globalIfNotDetached();
   v8::Local<v8::Object> releaseGlobal();
   void setGlobal(v8::Local<v8::Object>);
 
@@ -158,6 +68,10 @@
   DOMWrapperWorld& world() { return *m_world; }
 
  protected:
+  // TODO(dcheng): Remove this friend declaration once LocalWindowProxyManager
+  // and ScriptController are merged.
+  friend class ScriptController;
+
   // A valid transition is from ContextUninitialized to ContextInitialized,
   // and then ContextDetached. Other transitions are forbidden.
   enum class Lifecycle {
@@ -171,24 +85,24 @@
   virtual void initialize() = 0;
 
   enum GlobalDetachmentBehavior { DoNotDetachGlobal, DetachGlobal };
-  virtual void disposeContext(GlobalDetachmentBehavior) = 0;
+  virtual void disposeContext(GlobalDetachmentBehavior);
+
+  // Associates the window wrapper and its prototype chain with the native
+  // DOMWindow object.  Also does some more Window-specific initialization.
+  void setupWindowPrototypeChain();
 
   v8::Isolate* isolate() const { return m_isolate; }
   Frame* frame() const { return m_frame.get(); }
-
-#if DCHECK_IS_ON()
-  void didAttachGlobalProxy() { m_isGlobalProxyAttached = true; }
-  void didDetachGlobalProxy() { m_isGlobalProxyAttached = false; }
-#endif
+  ScriptState* getScriptState() const { return m_scriptState.get(); }
 
  private:
   v8::Isolate* const m_isolate;
   const Member<Frame> m_frame;
-#if DCHECK_IS_ON()
-  bool m_isGlobalProxyAttached = false;
-#endif
 
  protected:
+  // TODO(dcheng): Move this to LocalWindowProxy once RemoteWindowProxy uses
+  // remote contexts.
+  RefPtr<ScriptState> m_scriptState;
   // TODO(dcheng): Consider making these private and using getters.
   const RefPtr<DOMWrapperWorld> m_world;
   ScopedPersistent<v8::Object> m_globalProxy;