DXVA: Add --disable-low-latency-dxva to disable low latency decoding

gpu/command_buffer/service/gpu_preferences.h

 // Copyright 2016 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 43 matching lines @@
 #if defined(ENABLE_WEBRTC)
   // Disables HW encode acceleration for WebRTC.
   bool disable_web_rtc_hw_encoding = false;
 #endif
 
 #if defined(OS_WIN)
   // Enables experimental hardware acceleration for VP8/VP9 video decoding.
   // Bitmask - 0x1=Microsoft, 0x2=AMD, 0x03=Try all.
   VpxDecodeVendors enable_accelerated_vpx_decode = VPX_VENDOR_MICROSOFT;
 
+  // Enables using CODECAPI_AVLowLatencyMode.
+  bool enable_low_latency_dxva = true;
+
   // Enables support for avoiding copying DXGI NV12 textures.
   bool enable_zero_copy_dxgi_video = false;
 
   // Enables support for outputting NV12 video frames.
   bool enable_nv12_dxgi_video = false;
 #endif
 
   // ===================================
   // Settings from //gpu/command_buffer/service/gpu_switches.cc
 
@@ skipping 61 matching lines @@
   bool enable_unsafe_es3_apis = false;
 
   // Use the Pass-through command decoder, skipping all validation and state
   // tracking.
   bool use_passthrough_cmd_decoder = false;
 };
 
 }  // namespace gpu
 
 #endif // GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_