Revert of Added an extra sync token field for extra command buffer identification.

content/common/gpu/client/command_buffer_proxy_impl.cc

 // 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 "content/common/gpu/client/command_buffer_proxy_impl.h"
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/logging.h"
@@ skipping 431 matching lines @@
   params.size = gfx::Size(width, height);
   params.format = gpu_memory_buffer->GetFormat();
   params.internal_format = internal_format;
   params.image_release_count = image_fence_sync;
 
   if (!Send(new GpuCommandBufferMsg_CreateImage(route_id_, params)))
     return -1;
 
   if (image_fence_sync) {
     gpu::SyncToken sync_token(GetNamespaceID(), GetCommandBufferID(),
-                              GetExtraCommandBufferData(), image_fence_sync);
+                              image_fence_sync);
 
     // Force a synchronous IPC to validate sync token.
     channel_->ValidateFlushIDReachedServer(stream_id_, true);
     sync_token.SetVerifyFlush();
 
     gpu_memory_buffer_manager->SetDestructionSyncToken(gpu_memory_buffer,
                                                        sync_token);
   }
 
   return new_id;
@@ skipping 49 matching lines @@
 }
 
 gpu::CommandBufferNamespace CommandBufferProxyImpl::GetNamespaceID() const {
   return gpu::CommandBufferNamespace::GPU_IO;
 }
 
 uint64_t CommandBufferProxyImpl::GetCommandBufferID() const {
   return command_buffer_id_;
 }
 
-int32_t CommandBufferProxyImpl::GetExtraCommandBufferData() const {
-  return stream_id_;
-}
-
 uint64_t CommandBufferProxyImpl::GenerateFenceSyncRelease() {
   return next_fence_sync_release_++;
 }
 
 bool CommandBufferProxyImpl::IsFenceSyncRelease(uint64_t release) {
   return release != 0 && release < next_fence_sync_release_;
 }
 
 bool CommandBufferProxyImpl::IsFenceSyncFlushed(uint64_t release) {
   return release != 0 && release <= flushed_fence_sync_release_;
@@ skipping 38 matching lines @@
   }
 
   signal_tasks_.insert(std::make_pair(signal_id, callback));
 }
 
 bool CommandBufferProxyImpl::CanWaitUnverifiedSyncToken(
     const gpu::SyncToken* sync_token) {
   // Can only wait on an unverified sync token if it is from the same channel.
   const uint64_t token_channel = sync_token->command_buffer_id() >> 32;
   const uint64_t channel = command_buffer_id_ >> 32;
-  if (sync_token->namespace_id() != gpu::CommandBufferNamespace::GPU_IO ||
-      token_channel != channel) {
-    return false;
-  }
-
-  // If waiting on a different stream, flush pending commands on that stream.
-  const int32_t release_stream_id = sync_token->extra_data_field();
-  if (release_stream_id == 0)
-    return false;
-
-  if (release_stream_id != stream_id_)
-    channel_->FlushPendingStream(release_stream_id);
-
-  return true;
+  return (sync_token->namespace_id() == gpu::CommandBufferNamespace::GPU_IO &&
+          token_channel == channel);
 }
 
 uint32 CommandBufferProxyImpl::InsertSyncPoint() {
   CheckLock();
   if (last_state_.error != gpu::error::kNoError)
     return 0;
 
   uint32 sync_point = 0;
   Send(new GpuCommandBufferMsg_InsertSyncPoint(route_id_, true, &sync_point));
   return sync_point;
@@ skipping 157 matching lines @@
   }
 }
 
 void CommandBufferProxyImpl::OnUpdateVSyncParameters(base::TimeTicks timebase,
                                                      base::TimeDelta interval) {
   if (!update_vsync_parameters_completion_callback_.is_null())
     update_vsync_parameters_completion_callback_.Run(timebase, interval);
 }
 
 }  // namespace content