Move geolocation, desktop notification, and device orientation into their own message files.

content/common/device_orientation_messages.h

+// Copyright (c) 2011 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.
+
+// IPC messages for device orientation.
+// Multiply-included message file, hence no include guard.
+
+#include "ipc/ipc_message_macros.h"
+
+#define IPC_MESSAGE_START DeviceOrientationMsgStart
+
+IPC_STRUCT_BEGIN(DeviceOrientationMsg_Updated_Params)
+  // These fields have the same meaning as in device_orientation::Orientation.
+  IPC_STRUCT_MEMBER(bool, can_provide_alpha)
+  IPC_STRUCT_MEMBER(double, alpha)
+  IPC_STRUCT_MEMBER(bool, can_provide_beta)
+  IPC_STRUCT_MEMBER(double, beta)
+  IPC_STRUCT_MEMBER(bool, can_provide_gamma)
+  IPC_STRUCT_MEMBER(double, gamma)
+IPC_STRUCT_END()
+
+// Messages sent from the browser to the renderer.
+
+// Notification that the device's orientation has changed.
+IPC_MESSAGE_ROUTED1(DeviceOrientationMsg_Updated,
+                    DeviceOrientationMsg_Updated_Params)
+
+// Messages sent from the renderer to the browser.
+
+// A RenderView requests to start receiving device orientation updates.
+IPC_MESSAGE_CONTROL1(DeviceOrientationHostMsg_StartUpdating,
+                     int /* render_view_id */)
+
+// A RenderView requests to stop receiving device orientation updates.
+IPC_MESSAGE_CONTROL1(DeviceOrientationHostMsg_StopUpdating,
+                     int /* render_view_id */)