clang tot bots: Don't depend on svn.exe from depot_tools.

tools/clang/scripts/update.py

 #!/usr/bin/env python
 # 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.
 
 """This script is used to download prebuilt clang binaries.
 
 It is also used by package.py to build the prebuilt clang binaries."""
 
 import argparse
@@ skipping 294 matching lines @@
   # Unconditionally download a prebuilt gcc to guarantee the included libstdc++
   # works on Ubuntu Precise.
   gcc_dir = os.path.join(LLVM_BUILD_TOOLS_DIR, 'gcc482precise')
   if not os.path.exists(gcc_dir):
     print 'Downloading pre-built GCC 4.8.2...'
     DownloadAndUnpack(
         CDS_URL + '/tools/gcc482precise.tgz', LLVM_BUILD_TOOLS_DIR)
   args.gcc_toolchain = gcc_dir
 
 
+def AddSvnToPathOnWin():
+  """Download svn.exe and add it to PATH."""
+  if sys.platform != 'win32':
+    return
+  svn_ver = 'svn-1.6.6-win'
+  svn_dir = os.path.join(LLVM_BUILD_TOOLS_DIR, svn_ver)
+  if not os.path.exists(svn_dir):
+    DownloadAndUnpack(CDS_URL + '/tools/%s.zip' % svn_ver, LLVM_BUILD_TOOLS_DIR)
+  os.environ['PATH'] = svn_dir + os.pathsep + os.environ.get('PATH', '')
+
+
 def AddCMakeToPath():
   """Download CMake and add it to PATH."""
   if sys.platform == 'win32':
     zip_name = 'cmake-3.4.3-win32-x86.zip'
     cmake_dir = os.path.join(LLVM_BUILD_TOOLS_DIR,
                              'cmake-3.4.3-win32-x86', 'bin')
   else:
     suffix = 'Darwin' if sys.platform == 'darwin' else 'Linux'
     zip_name = 'cmake343_%s.tgz' % suffix
     cmake_dir = os.path.join(LLVM_BUILD_TOOLS_DIR, 'cmake343', 'bin')
@@ skipping 116 matching lines @@
 
   if args.with_android and not os.path.exists(ANDROID_NDK_DIR):
     print 'Android NDK not found at ' + ANDROID_NDK_DIR
     print 'The Android NDK is needed to build a Clang whose -fsanitize=address'
     print 'works on Android. See '
     print 'https://www.chromium.org/developers/how-tos/android-build-instructions'
     print 'for how to install the NDK, or pass --without-android.'
     return 1
 
   DownloadHostGcc(args)
+  AddSvnToPathOnWin()
   AddCMakeToPath()
   AddGnuWinToPath()
 
   DeleteChromeToolsShim()
 
   Checkout('LLVM', LLVM_REPO_URL + '/llvm/trunk', LLVM_DIR)
   Checkout('Clang', LLVM_REPO_URL + '/cfe/trunk', CLANG_DIR)
   if sys.platform == 'win32' or use_head_revision:
     Checkout('LLD', LLVM_REPO_URL + '/lld/trunk', LLD_DIR)
   Checkout('compiler-rt', LLVM_REPO_URL + '/compiler-rt/trunk', COMPILER_RT_DIR)
@@ skipping 437 matching lines @@
     args.force_local_build = True
     if 'OS=android' not in os.environ.get('GYP_DEFINES', ''):
       # Only build the Android ASan rt on ToT bots when targetting Android.
       args.with_android = False
 
   return UpdateClang(args)
 
 
 if __name__ == '__main__':
   sys.exit(main())