gpu: Use mojom API for recording log messages to the host.

services/ui/gpu/gpu_service.h

Index: services/ui/gpu/gpu_service.h
diff --git a/services/ui/gpu/gpu_service.h b/services/ui/gpu/gpu_service.h
index aac89381d1d3f86f879ec998a9ea8916124ea36e..f8412a3bcd7416e6d1ae2f4ef8699846144d45e3 100644
--- a/services/ui/gpu/gpu_service.h
+++ b/services/ui/gpu/gpu_service.h
@@ -82,6 +82,11 @@ class GpuService : public gpu::GpuChannelManagerDelegate,
  private:
   friend class GpuMain;
 
+  void RecordLogMessage(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+                        int severity,
+                        size_t message_start,
+                        const std::string& message);
+
   gpu::SyncPointManager* sync_point_manager() { return sync_point_manager_; }
 
   gpu::gles2::MailboxManager* mailbox_manager() {