Linux: add GYP flag to build with system libbz2.

chrome/browser/metrics/metrics_service.cc

 // Copyright (c) 2006-2009 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.
 
 
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
@@ skipping 144 matching lines @@
 //
 //------------------------------------------------------------------------------
 
 #include "chrome/browser/metrics/metrics_service.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <objbase.h>
 #endif
 
+#if defined(USE_SYSTEM_LIBBZ2)
+#include <bzlib.h>
+#else
+#include "third_party/bzip2/bzlib.h"
+#endif
+
 #include "base/file_path.h"
 #include "base/histogram.h"
 #include "base/path_service.h"
 #include "base/platform_thread.h"
 #include "base/rand_util.h"
 #include "base/string_util.h"
 #include "base/task.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/load_notification_details.h"
 #include "chrome/browser/memory_details.h"
 #include "chrome/browser/plugin_service.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_model.h"
 #include "chrome/common/child_process_info.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/histogram_synchronizer.h"
 #include "chrome/common/libxml_utils.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/pref_service.h"
 #include "chrome/common/render_messages.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/load_flags.h"
-#include "third_party/bzip2/bzlib.h"
 
 #if defined(OS_POSIX)
 // TODO(port): Move these headers above as they are ported.
 #include "chrome/common/temp_scaffolding_stubs.h"
 #else
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/google_update_settings.h"
 #endif
 
 using base::Time;
@@ skipping 1714 matching lines @@
       L"." + key;
   prof_prefs->SetInteger(pref_key.c_str(), value);
 }
 
 static bool IsSingleThreaded() {
   static PlatformThreadId thread_id = 0;
   if (!thread_id)
     thread_id = PlatformThread::CurrentId();
   return PlatformThread::CurrentId() == thread_id;
 }