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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 orientation.
      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 
     11 #define IPC_MESSAGE_START DeviceOrientationMsgStart
     12 
     13 // Asks the browser process to activate Device Orientation sensors if necessary.
     14 IPC_MESSAGE_CONTROL0(DeviceOrientationHostMsg_StartPolling)
     15 
     16 // The browser process asynchronously returns the shared memory handle that will
     17 // hold the data from the hardware sensors.
     18 // See device_orientation_hardware_buffer.h for a description of how
     19 // synchronization is handled.
     20 IPC_MESSAGE_CONTROL1(DeviceOrientationMsg_DidStartPolling,
     21                      base::SharedMemoryHandle /* handle */)
     22 
     23 // Notifies the browser process that the renderer process is not using the
     24 // Device Orientation data anymore. The number of Starts should match the
     25 // number of Stops.
     26 IPC_MESSAGE_CONTROL0(DeviceOrientationHostMsg_StopPolling)
     27