Make compression optional in TraceUploader.

content/public/browser/trace_uploader.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_TRACE_UPLOADER_H_
 #define CONTENT_PUBLIC_BROWSER_TRACE_UPLOADER_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 
 namespace content {
 
 // Used to implement a trace upload service for use in about://tracing,
 // which gets requested through the TracingDelegate.
 class TraceUploader {
  public:
   // This should be called when the tracing is complete.
   // The bool denotes success or failure, the string is feedback
   // to show in the Tracing UI.
   typedef base::Callback<void(bool, const std::string&)> UploadDoneCallback;
   // Call this to update the progress UI with the current bytes uploaded,
   // as well as the total.
   typedef base::Callback<void(int64, int64)> UploadProgressCallback;
 
   virtual ~TraceUploader() {}
 
+  enum UploadMode { COMPRESSED_UPLOAD, UNCOMPRESSED_UPLOAD };
+
   // Compresses and uploads the given file contents.
   virtual void DoUpload(const std::string& file_contents,
+                        UploadMode upload_mode,
                         scoped_ptr<base::DictionaryValue> metadata,
                         const UploadProgressCallback& progress_callback,
                         const UploadDoneCallback& done_callback) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_TRACE_UPLOADER_H_