Add HTTPMultipartBuilder and its test.

util/net/http_body_test_util.cc

Index: util/net/http_body_test_util.cc
diff --git a/util/net/http_body_test_util.cc b/util/net/http_body_test_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3d732311078e632494cca6c7d76ab04beffb3bcd
--- /dev/null
+++ b/util/net/http_body_test_util.cc
@@ -0,0 +1,48 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/net/http_body_test_util.h"
+
+#include <stdint.h>
+
+#include "base/memory/scoped_ptr.h"
+#include "gtest/gtest.h"
+#include "util/net/http_body.h"
+
+namespace crashpad {
+namespace test {
+
+std::string ReadStreamToString(HTTPBodyStream* stream) {
+  return ReadStreamToString(stream, 32);
+}
+
+std::string ReadStreamToString(HTTPBodyStream* stream, size_t buffer_size) {
+  scoped_ptr<uint8_t[]> buf(new uint8_t[buffer_size]);
+  std::string result;
+
+  ssize_t bytes_read;
+  while ((bytes_read = stream->GetBytesBuffer(buf.get(), buffer_size)) != 0) {
+    if (bytes_read < 0) {
+      ADD_FAILURE() << "Failed to read from stream: " << bytes_read;
+      return std::string();
+    }
+
+    result.append(reinterpret_cast<char*>(buf.get()), bytes_read);
+  }
+
+  return result;
+}
+
+}  // namespace test
+}  // namespace crashpad