Decouple capture timestamp and reference time

content/common/media/video_capture_messages.h

 // Copyright (c) 2012 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 "base/memory/shared_memory.h"
 #include "content/common/content_export.h"
 #include "content/common/media/video_capture.h"
 #include "content/public/common/common_param_traits.h"
 #include "ipc/ipc_message_macros.h"
 #include "media/base/video_capture_types.h"
@@ skipping 15 matching lines @@
 
 IPC_STRUCT_TRAITS_BEGIN(media::VideoCaptureParams)
   IPC_STRUCT_TRAITS_MEMBER(requested_format)
   IPC_STRUCT_TRAITS_MEMBER(resolution_change_policy)
   IPC_STRUCT_TRAITS_MEMBER(power_line_frequency)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_BEGIN(VideoCaptureMsg_BufferReady_Params)
   IPC_STRUCT_MEMBER(int, device_id)
   IPC_STRUCT_MEMBER(int, buffer_id)
-  IPC_STRUCT_MEMBER(base::TimeTicks, timestamp)
+  IPC_STRUCT_MEMBER(base::TimeDelta, timestamp)
   IPC_STRUCT_MEMBER(base::DictionaryValue, metadata)
   IPC_STRUCT_MEMBER(media::VideoPixelFormat, pixel_format)
   IPC_STRUCT_MEMBER(media::VideoFrame::StorageType, storage_type)
   IPC_STRUCT_MEMBER(gfx::Size, coded_size)
   IPC_STRUCT_MEMBER(gfx::Rect, visible_rect)
 IPC_STRUCT_END()
 
 // TODO(nick): device_id in these messages is basically just a route_id. We
 // should shift to IPC_MESSAGE_ROUTED and use MessageRouter in the filter impls.
 
@@ skipping 78 matching lines @@
 
 // Get the formats supported by a device referenced by |capture_session_id|.
 IPC_MESSAGE_CONTROL2(VideoCaptureHostMsg_GetDeviceSupportedFormats,
                      int /* device_id */,
                      media::VideoCaptureSessionId /* session_id */)
 
 // Get the format(s) in use by a device referenced by |capture_session_id|.
 IPC_MESSAGE_CONTROL2(VideoCaptureHostMsg_GetDeviceFormatsInUse,
                      int /* device_id */,
                      media::VideoCaptureSessionId /* session_id */)