Upgrading lzma_sdk to version 9.20.

chrome/tools/build/win/create_installer_archive.py

Index: chrome/tools/build/win/create_installer_archive.py
===================================================================
--- chrome/tools/build/win/create_installer_archive.py	(revision 79843)
+++ chrome/tools/build/win/create_installer_archive.py	(working copy)
@@ -1,5 +1,5 @@
 #!/usr/bin/python
-# Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+# Copyright (c) 2011 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.
 
@@ -74,7 +74,16 @@
 
 def CompressUsingLZMA(output_dir, compressed_file, input_file):
   lzma_exec = GetLZMAExec(output_dir)
-  cmd = '%s a -t7z "%s" "%s" -mx9' % (lzma_exec, compressed_file, input_file)
+  cmd = ('%s a -t7z '
+         # Flags equivalent to -mx9 but with bcj2 turned on (exe pre-filter).
+         # This results in ~3MB decrease in installer size on a 24MB installer.
+         '-m0=BCJ2 '
+         '-m1=LZMA:d26:fb64 '
+         '-m2=LZMA:d20:fb64:mf=bt2 '
+         '-m3=LZMA:d20:fb64:mf=bt2 '
+         '-mb0:1 -mb0s1:2 '
+         '-mb0s2:3 '
+         '"%s" "%s"') % (lzma_exec, compressed_file, input_file)
   if os.path.exists(compressed_file):
     os.remove(compressed_file)
   RunSystemCommand(cmd)
@@ -132,7 +141,7 @@
 
 def GetLZMAExec(output_dir):
   lzma_exec = os.path.join(output_dir, "..", "..", "third_party",
-                           "lzma_sdk", "Executable", "7za.exe")
+                           "lzma_sdk", "7zr.exe")
   return lzma_exec
 
 def GetPrevVersion(output_dir, temp_dir, last_chrome_installer):
@@ -191,7 +200,7 @@
                               options.output_name + ARCHIVE_SUFFIX)
   cmd = '%s a -t7z "%s" "%s" -mx0' % (lzma_exec, archive_file,
                                       os.path.join(staging_dir, CHROME_DIR))
-  # There doesnt seem to be any way in 7za.exe to override existing file so
+  # There doesnt seem to be any way in 7zr.exe to override existing file so
   # we always delete before creating a new one.
   if not os.path.exists(archive_file):
     RunSystemCommand(cmd)