Limit the background trials upload size to 100Kib when using mobile data

chrome/browser/tracing/crash_service_uploader.h

 // Copyright 2014 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 CHROME_BROWSER_TRACING_CRASH_SERVICE_UPLOADER_H_
 #define CHROME_BROWSER_TRACING_CRASH_SERVICE_UPLOADER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 15 matching lines @@
 // TraceCrashServiceUploader uploads traces to the Chrome crash service.
 class TraceCrashServiceUploader : public content::TraceUploader,
                                   public net::URLFetcherDelegate {
  public:
   explicit TraceCrashServiceUploader(
       net::URLRequestContextGetter* request_context);
   ~TraceCrashServiceUploader() override;
 
   void SetUploadURL(const std::string& url);
 
+  void SetMaxUploadBytes(size_t max_upload_bytes);
+
   // net::URLFetcherDelegate implementation.
   void OnURLFetchComplete(const net::URLFetcher* source) override;
   void OnURLFetchUploadProgress(const net::URLFetcher* source,
                                 int64_t current,
                                 int64_t total) override;
 
   // content::TraceUploader
   void DoUpload(const std::string& file_contents,
                 UploadMode upload_mode,
                 std::unique_ptr<const base::DictionaryValue> metadata,
@@ skipping 29 matching lines @@
   void OnUploadError(const std::string& error_message);
 
   std::unique_ptr<net::URLFetcher> url_fetcher_;
   UploadProgressCallback progress_callback_;
   UploadDoneCallback done_callback_;
 
   net::URLRequestContextGetter* request_context_;
 
   std::string upload_url_;
 
+  size_t max_upload_bytes_;
+
   DISALLOW_COPY_AND_ASSIGN(TraceCrashServiceUploader);
 };
 
 #endif  // CHROME_BROWSER_TRACING_CRASH_SERVICE_UPLOADER_H_