Add HTTPTransport, a Mac implementation, and an end-to-end test.

util/net/http_multipart_builder.h

 // 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.
 
 #ifndef CRASHPAD_UTIL_NET_HTTP_MULTIPART_BUILDER_H_
 #define CRASHPAD_UTIL_NET_HTTP_MULTIPART_BUILDER_H_
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
+#include "util/net/http_headers.h"
 
 namespace crashpad {
 
 class HTTPBodyStream;
 
 //! \brief This class is used to build a MIME multipart message, conforming to
 //!     RFC 2046, for use as a HTTP request body.
 class HTTPMultipartBuilder {
  public:
   HTTPMultipartBuilder();
@@ skipping 22 matching lines @@
                          const std::string& upload_file_name,
                          const base::FilePath& path,
                          const std::string& content_type);
 
   //! \brief Generates the HTTPBodyStream for the data currently supplied to
   //!     the builder.
   //!
   //! \return A caller-owned HTTPBodyStream object.
   scoped_ptr<HTTPBodyStream> GetBodyStream();
 
-  //! \brief Gets the boundary that will be used in GetBodyStream().
-  std::string boundary() const { return boundary_; }
+  //! \brief Gets the header pair for `"Content-Type"`.
+  HTTPHeaders::value_type GetContentType() const;
 
  private:
   struct FileAttachment {
     std::string filename;
     std::string content_type;
     base::FilePath path;
   };
 
   // Removes elements from both data maps at the specified |key|, to ensure
   // uniqueness across the entire HTTP body.
   void EraseKey(const std::string& key);
 
   std::string boundary_;
   std::map<std::string, std::string> form_data_;
   std::map<std::string, FileAttachment> file_attachments_;
 
   DISALLOW_COPY_AND_ASSIGN(HTTPMultipartBuilder);
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_NET_HTTP_MULTIPART_BUILDER_H_