- 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/osr/browser_platform_delegate_osr_linux.cc

@@ -0,0 +1,18 @@
+// Copyright 2015 The Chromium Embedded Framework 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 "libcef/browser/osr/browser_platform_delegate_osr_linux.h"
+
+#include "libcef/browser/browser_host_impl.h"
+
+CefBrowserPlatformDelegateOsrLinux::CefBrowserPlatformDelegateOsrLinux(
+    scoped_ptr<CefBrowserPlatformDelegateNative> native_delegate)
+    : CefBrowserPlatformDelegateOsr(native_delegate.Pass()) {
+}
+
+CefWindowHandle
+    CefBrowserPlatformDelegateOsrLinux::GetHostWindowHandle() const {
+  return native_delegate_->window_info().parent_window;
+}
+