content/common/device_sensors/device_motion_messages.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // IPC messages for device motion.
   6 // Multiply-included message file, hence no include guard.
   7
   8 #include "base/memory/shared_memory.h"
   9 #include "ipc/ipc_message_macros.h"
  10 #include "ipc/ipc_param_traits.h"
  11 #include "ipc/ipc_platform_file.h"
  12
  13 #define IPC_MESSAGE_START DeviceMotionMsgStart
  14
  15 // Asks the browser process to activate Device Motion sensors if necessary.
  16 IPC_MESSAGE_CONTROL0(DeviceMotionHostMsg_StartPolling)
  17
  18 // The browser process asynchronously returns the shared memory handle that will
  19 // hold the data from the hardware sensors.
  20 // See device_motion_hardware_buffer.h for a description of how
  21 // synchronization is handled.
  22 IPC_MESSAGE_CONTROL1(DeviceMotionMsg_DidStartPolling,
  23                      base::SharedMemoryHandle /* handle */)
  24
  25 // Notifies the browser process that the renderer process is not using the
  26 // Device Motion data anymore. The number of Starts should match the number
  27 // of Stops.
  28 IPC_MESSAGE_CONTROL0(DeviceMotionHostMsg_StopPolling)