- Factor platform-specific code out of CefBrowserHostImpl (issue #1749).

- Introduce native/ and osr/ folders for native (non-platform-agnostic) and
    osr (windowless) code respectively.
  - Introduce CefBrowserPlatformDelegate for abstracting platform-specific
    implementations of browser host functionality.
  - Move dialog and menu code to separate manager and platform-specific runner
    implementations exposed via CefBrowserPlatformDelegate.
  - Standardize focus-handling behavior between windowed and windowless
    implementations. CefFocusHandler::OnSetFocus() will now also be called for
    osr focus changes.
- Support multiple simultaneous popups (issue #1289).

libcef/browser/javascript_dialog_runner.h

@@ -0,0 +1,46 @@
+// Copyright (c) 2012 The Chromium Embedded Framework Authors.
+// Portions copyright (c) 2012 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.
+
+#ifndef CEF_LIBCEF_BROWSER_JAVASCRIPT_DIALOG_RUNNER_H_
+#define CEF_LIBCEF_BROWSER_JAVASCRIPT_DIALOG_RUNNER_H_
+#pragma once
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string16.h"
+#include "content/public/common/javascript_message_type.h"
+
+class CefBrowserHostImpl;
+
+class CefJavaScriptDialogRunner {
+ public:
+  typedef base::Callback<void(bool /* success */,
+                              const base::string16& /* user_input */)>
+                                  DialogClosedCallback;
+
+  // Run the dialog. Execute |callback| on completion.
+  virtual void Run(
+      CefBrowserHostImpl* browser,
+      content::JavaScriptMessageType message_type,
+      const base::string16& display_url,
+      const base::string16& message_text,
+      const base::string16& default_prompt_text,
+      const DialogClosedCallback& callback) = 0;
+
+  // Cancel a dialog mid-flight.
+  virtual void Cancel() = 0;
+
+ protected:
+  // Allow deletion via scoped_ptr only.
+  friend struct base::DefaultDeleter<CefJavaScriptDialogRunner>;
+
+  CefJavaScriptDialogRunner() {}
+  virtual ~CefJavaScriptDialogRunner() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CefJavaScriptDialogRunner);
+};
+
+#endif  // CEF_LIBCEF_BROWSER_JAVASCRIPT_DIALOG_RUNNER_H_