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

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index 50b2089a59c095b14a48d549a4f1f898ed41348f..745e05884f4789d69e86c2db794456dd147bc0fa 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -5441,6 +5441,7 @@ void GLES2Implementation::GenSyncTokenCHROMIUM(GLuint64 fence_sync,
 
   // Copy the data over after setting the data to ensure alignment.
   SyncToken sync_token_data(gpu_control_->GetNamespaceID(),
+                            gpu_control_->GetExtraCommandBufferData(),
                             gpu_control_->GetCommandBufferID(), fence_sync);
   sync_token_data.SetVerifyFlush();
   memcpy(sync_token, &sync_token_data, sizeof(sync_token_data));
@@ -5464,6 +5465,7 @@ void GLES2Implementation::GenUnverifiedSyncTokenCHROMIUM(GLuint64 fence_sync,
 
   // Copy the data over after setting the data to ensure alignment.
   SyncToken sync_token_data(gpu_control_->GetNamespaceID(),
+                            gpu_control_->GetExtraCommandBufferData(),
                             gpu_control_->GetCommandBufferID(), fence_sync);
   memcpy(sync_token, &sync_token_data, sizeof(sync_token_data));
 }