Google OAuth Device Flow support for FNL

mojo/data_pipe_utils/data_pipe_utils.cc

Index: mojo/data_pipe_utils/data_pipe_utils.cc
diff --git a/mojo/data_pipe_utils/data_pipe_utils.cc b/mojo/data_pipe_utils/data_pipe_utils.cc
index af9f2062bd7c045a7d5d2c23faf7424aa0e4abc1..dd989c4399bd7d991ff89db3ba666767903f1ae2 100644
--- a/mojo/data_pipe_utils/data_pipe_utils.cc
+++ b/mojo/data_pipe_utils/data_pipe_utils.cc
@@ -111,5 +111,20 @@ bool BlockingCopyFromString(const std::string& source,
   }
 }
 
+mojo::ScopedDataPipeConsumerHandle WriteStringToConsumerHandle(
+    const std::string& source) {
+  mojo::ScopedDataPipeConsumerHandle consumer;
+  mojo::ScopedDataPipeProducerHandle producer;
+  static const size_t max_buffer_size = 2 * 1024 * 1024;  // 2MB
+  DCHECK_LE(source.size(), max_buffer_size);
+  MojoCreateDataPipeOptions options = {
+      sizeof(MojoCreateDataPipeOptions),
+      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE, 1,
+      std::min(source.size(), max_buffer_size)};
+  mojo::CreateDataPipe(&options, &producer, &consumer);
+  BlockingCopyFromString(source, producer);
+  return consumer.Pass();
+}
+
 }  // namespace common
 }  // namespace mojo