Replace window.external with a v8::extension.

chrome/renderer/external_extension.cc

Index: chrome/renderer/external_extension.cc
===================================================================
--- chrome/renderer/external_extension.cc	(revision 0)
+++ chrome/renderer/external_extension.cc	(revision 0)
@@ -0,0 +1,61 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/renderer/external_extension.h"
+#include "chrome/renderer/render_view.h"
+#include "webkit/glue/webframe.h"
+
+namespace extensions_v8 {
+
+const char* kExternalExtensionName = "v8/External";
+
+class ExternalExtensionWrapper : public v8::Extension {
+ public:
+  ExternalExtensionWrapper()
+      : v8::Extension(
+            kExternalExtensionName,
+            "var external;"
+            "if (!external)"
+            "  external = {};"
+            "external.AddSearchProvider = function(name) {"
+            "  native function NativeAddSearchProvider();"
+            "  NativeAddSearchProvider(name);"
+            "}") {}
+
+    virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
+        v8::Handle<v8::String> name) {
+      if (name->Equals(v8::String::New("NativeAddSearchProvider"))) {
+        return v8::FunctionTemplate::New(AddSearchProvider);
+      }
+      return v8::Handle<v8::FunctionTemplate>();
+    }
+
+    static v8::Handle<v8::Value> AddSearchProvider(const v8::Arguments& args) {
+      if (!args.Length())
+        return v8::Undefined();
+
+      WebFrame* webframe = WebFrame::RetrieveActiveFrame();
+      DCHECK(webframe) << "There should be an active frame since we just got "
+                          "a native function called.";
+      if (!webframe) return v8::Undefined();
+
+      WebView* webview = webframe->GetView();
+      if (!webview) return v8::Undefined();  // can happen during closing
+
+      RenderView* renderview = static_cast<RenderView*>(webview->GetDelegate());
+      if (!renderview) return v8::Undefined();
+
+      std::string name = std::string(*v8::String::Utf8Value(args[0]));
+      if (!name.length()) return v8::Undefined();;
+
+      renderview->AddSearchProvider(name);
+      return v8::Undefined();
+    }
+};
+
+v8::Extension*  ExternalExtension::Get() {
+  return new ExternalExtensionWrapper();
+}
+
+}  // namespace extensions_v8