Chromium plumbing for Screen Orientation API orientationchange events.

content/browser/screen_orientation/screen_orientation_dispatcher_host.cc

+// Copyright 2014 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 "content/browser/screen_orientation/screen_orientation_dispatcher_host.h"
+
+#include "content/common/screen_orientation_messages.h"
+
+namespace content {
+
+ScreenOrientationDispatcherHost::ScreenOrientationDispatcherHost()
+  : BrowserMessageFilter(ScreenOrientationMsgStart) {
+}
+
+bool ScreenOrientationDispatcherHost::OnMessageReceived(
+    const IPC::Message& message, bool* message_was_ok) {
+  // TODO(mlamouri): we will handle lock and unlock requests here.
+  return false;
+}
+
+void ScreenOrientationDispatcherHost::OnOrientationChange(
+    int orientation) {
+  // TODO(mlamouri): we might want to have OrientationChangeEvent to pass us
+  // a WebScreenOrientation instead of an int so we can let the backend decide
+  // of the relation between angle and orientation name.
+  Send(new ScreenOrientationMsg_OrientationChange(orientation));

[ostap, 2014/02/20 20:51:12]

The RenderView on renderer side already has OnOrientationChangeEvent(). Why not
to use it? In this case extra IPC is not necessary.

[mlamouri (slow - plz ping), 2014/02/20 21:07:05]

The idea is to merge window.orientation and screen.orientation implementation
later. At that point, OnOrientationChangeEvent will be be replaced with this.

+}
+
+}  // namespace content