Adding in-process crash dumping library and crash uploader

src/platform/crash/user_collector.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "crash/user_collector.h"
@@ skipping 39 matching lines @@
     return "core";
   }
 }
 
 bool UserCollector::SetUpInternal(bool enabled) {
   CHECK(initialized_);
   logger_->LogInfo("%s crash handling", enabled ? "Enabling" : "Disabling");
   std::string pattern = GetPattern(enabled);
   if (file_util::WriteFile(FilePath(core_pattern_file_),
                            pattern.c_str(),
-                           pattern.length()) != pattern.length()) {
+                           pattern.length()) !=
+      static_cast<int>(pattern.length())) {
     logger_->LogError("Unable to write %s", core_pattern_file_.c_str());
     return false;
   }
   return true;
 }
 
 void UserCollector::HandleCrash(int signal, int pid, const std::string &exec) {
   CHECK(initialized_);
   logger_->LogWarning("Received crash notification for %s[%d] sig %d",
                       exec.c_str(), pid, signal);
 
   if (is_feedback_allowed_function_()) {
     count_crash_function_();
   }
 }