- 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/native/browser_platform_delegate_native.cc

@@ -0,0 +1,47 @@
+// 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/native/browser_platform_delegate_native.h"
+
+#include "libcef/browser/browser_host_impl.h"
+
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/render_widget_host.h"
+
+CefBrowserPlatformDelegateNative::CefBrowserPlatformDelegateNative(
+    const CefWindowInfo& window_info)
+    : window_info_(window_info),
+      windowless_handler_(nullptr) {
+}
+
+void CefBrowserPlatformDelegateNative::WasResized() {
+  content::RenderViewHost* host = browser_->web_contents()->GetRenderViewHost();
+  if (host)
+    host->GetWidget()->WasResized();
+}
+
+void CefBrowserPlatformDelegateNative::SendKeyEvent(
+    const content::NativeWebKeyboardEvent& event) {
+  content::RenderViewHost* host = browser_->web_contents()->GetRenderViewHost();
+  if (host)
+    host->GetWidget()->ForwardKeyboardEvent(event);
+}
+
+void CefBrowserPlatformDelegateNative::SendMouseEvent(
+    const blink::WebMouseEvent& event) {
+  content::RenderViewHost* host = browser_->web_contents()->GetRenderViewHost();
+  if (host)
+    host->GetWidget()->ForwardMouseEvent(event);
+}
+
+void CefBrowserPlatformDelegateNative::SendMouseWheelEvent(
+    const blink::WebMouseWheelEvent& event) {
+  content::RenderViewHost* host = browser_->web_contents()->GetRenderViewHost();
+  if (host)
+    host->GetWidget()->ForwardWheelEvent(event);
+}
+
+bool CefBrowserPlatformDelegateNative::IsWindowless() const {
+  return false;
+}