[Extensions] Add crash tracking

extensions/browser/sandboxed_unpacker.cc

 // Copyright (c) 2012 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.
 
 #include "extensions/browser/sandboxed_unpacker.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 210 matching lines @@
     int creation_flags,
     const base::FilePath& extensions_dir,
     const scoped_refptr<base::SequencedTaskRunner>& unpacker_io_task_runner,
     SandboxedUnpackerClient* client)
     : client_(client),
       extensions_dir_(extensions_dir),
       got_response_(false),
       location_(location),
       creation_flags_(creation_flags),
       unpacker_io_task_runner_(unpacker_io_task_runner),
-      utility_wrapper_(new UtilityHostWrapper) {}
+      utility_wrapper_(new UtilityHostWrapper) {
+  // Tracking for crbug.com/692069. The location must be valid. If it's invalid,
+  // the utility process kills itself for a bad IPC.
+  CHECK_GT(location, Manifest::INVALID_LOCATION);
+  CHECK_LT(location, Manifest::NUM_LOCATIONS);
+}
 
 bool SandboxedUnpacker::CreateTempDirectory() {
   CHECK(unpacker_io_task_runner_->RunsTasksOnCurrentThread());
 
   base::FilePath temp_dir;
   if (!FindWritableTempLocation(extensions_dir_, &temp_dir)) {
     ReportFailure(COULD_NOT_GET_TEMP_DIRECTORY,
                   l10n_util::GetStringFUTF16(
                       IDS_EXTENSION_PACKAGE_INSTALL_ERROR,
                       ASCIIToUTF16("COULD_NOT_GET_TEMP_DIRECTORY")));
@@ skipping 683 matching lines @@
 
 SandboxedUnpacker::UtilityHostWrapper::~UtilityHostWrapper() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (utility_host_) {
     utility_host_->EndBatchMode();
     utility_host_.reset();
   }
 }
 
 }  // namespace extensions