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      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)
     29