gpu: Add sync token dependencies to flush metadata.

gpu/ipc/client/gpu_channel_host.h

Index: gpu/ipc/client/gpu_channel_host.h
diff --git a/gpu/ipc/client/gpu_channel_host.h b/gpu/ipc/client/gpu_channel_host.h
index 989f1df6a8d60895655b94d7a755fb88aa3c791b..15543be6aadcc96031ec93472d95be88c035af6c 100644
--- a/gpu/ipc/client/gpu_channel_host.h
+++ b/gpu/ipc/client/gpu_channel_host.h
@@ -41,7 +41,7 @@ class GpuMemoryBufferManager;
 }
 
 namespace gpu {
-
+struct SyncToken;
 class GpuChannelHost;
 using GpuChannelEstablishedCallback =
     base::Callback<void(scoped_refptr<GpuChannelHost>)>;
@@ -101,14 +101,16 @@ class GPU_EXPORT GpuChannelHost
   // routes. Combines multiple OrderingBarriers into a single AsyncFlush.
   // Returns the flush ID for the stream or 0 if put offset was not changed.
   // Outputs *highest_verified_flush_id.
-  uint32_t OrderingBarrier(int32_t route_id,
-                           int32_t stream_id,
-                           int32_t put_offset,
-                           uint32_t flush_count,
-                           const std::vector<ui::LatencyInfo>& latency_info,
-                           bool put_offset_changed,
-                           bool do_flush,
-                           uint32_t* highest_verified_flush_id);
+  uint32_t OrderingBarrier(
+      int32_t route_id,
+      int32_t stream_id,
+      int32_t put_offset,
+      uint32_t flush_count,
+      const std::vector<ui::LatencyInfo>& latency_info,
+      const std::vector<SyncToken>& sync_token_dependencies,
+      bool put_offset_changed,
+      bool do_flush,
+      uint32_t* highest_verified_flush_id);
 
   void FlushPendingStream(int32_t stream_id);
 
@@ -232,6 +234,7 @@ class GPU_EXPORT GpuChannelHost
     uint32_t flush_count;
     uint32_t flush_id;
     std::vector<ui::LatencyInfo> latency_info;
+    std::vector<SyncToken> sync_token_dependencies;
   };
 
   GpuChannelHost(GpuChannelHostFactory* factory,