Added more strict checks for fence sync counters.

gpu/ipc/service/gpu_command_buffer_stub.cc

Index: gpu/ipc/service/gpu_command_buffer_stub.cc
diff --git a/gpu/ipc/service/gpu_command_buffer_stub.cc b/gpu/ipc/service/gpu_command_buffer_stub.cc
index b90275aae15abbc1372ac069b8c65cde9758b463..d9b0080bbcac10cff69bb1638bb220909a34f45e 100644
--- a/gpu/ipc/service/gpu_command_buffer_stub.cc
+++ b/gpu/ipc/service/gpu_command_buffer_stub.cc
@@ -1033,6 +1033,8 @@ void GpuCommandBufferStub::OnCreateImage(
 
   image_manager->AddImage(image.get(), id);
   if (image_release_count) {
+    DCHECK_EQ(image_release_count,
+              sync_point_client_->client_state()->fence_sync_release() + 1);
     sync_point_client_->ReleaseFenceSync(image_release_count);
   }
 }