- 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/file_dialog_runner.h

@@ -0,0 +1,53 @@
+// 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_FILE_DIALOG_RUNNER_H_
+#define CEF_LIBCEF_BROWSER_FILE_DIALOG_RUNNER_H_
+#pragma once
+
+#include <vector>
+
+#include "base/files/file_path.h"
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/public/common/file_chooser_params.h"
+
+class CefBrowserHostImpl;
+
+class CefFileDialogRunner {
+ public:
+  // Extend content::FileChooserParams with some options unique to CEF.
+  struct FileChooserParams : public content::FileChooserParams {
+    // 0-based index of the selected value in |accept_types|.
+    int selected_accept_filter = 0;
+
+    // True if the Save dialog should prompt before overwriting files.
+    bool overwriteprompt = true;
+
+    // True if read-only files should be hidden.
+    bool hidereadonly = true;
+  };
+
+  // The argument vector will be empty if the dialog was canceled.
+  typedef base::Callback<void(int, const std::vector<base::FilePath>&)>
+      RunFileChooserCallback;
+
+  // Display the file chooser dialog. Execute |callback| on completion.
+  virtual void Run(CefBrowserHostImpl* browser,
+                   const FileChooserParams& params,
+                   RunFileChooserCallback callback) = 0;
+
+ protected:
+  // Allow deletion via scoped_ptr only.
+  friend struct base::DefaultDeleter<CefFileDialogRunner>;
+
+  CefFileDialogRunner() {}
+  virtual ~CefFileDialogRunner() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CefFileDialogRunner);
+};
+
+#endif  // CEF_LIBCEF_BROWSER_FILE_DIALOG_RUNNER_H_