Updates to make install_third_party build gtest and gmock on windows.

build_tools/install_gtest/install_gtest.py

Index: build_tools/install_gtest/install_gtest.py
===================================================================
--- build_tools/install_gtest/install_gtest.py	(revision 760)
+++ build_tools/install_gtest/install_gtest.py	(working copy)
@@ -73,14 +73,22 @@
 def PatchAll(options):
   def Patch(abs_path, patch_file):
     print "Patching %s with: %s" % (abs_path, patch_file)
-    p = subprocess.Popen('chmod -R a+w . && patch -p0 < %s' % (patch_file),
+    command = ''
+    if (sys.platform == 'win32'):
+      command = 'patch -p0 < %s' % (patch_file)
+    else:
+      command = 'chmod -R a+w . && patch -p0 < %s' % (patch_file)
+    p = subprocess.Popen(command,
                          cwd=abs_path,
                          env=options.shell_env,
                          shell=True)
     assert p.wait() == 0
 
-  Patch(options.working_dir, os.path.join(options.script_dir, GTEST_PATCH_FILE))
-  Patch(options.working_dir, os.path.join(options.script_dir, GMOCK_PATCH_FILE))
+  patch_path = os.path.join(options.script_dir, GTEST_PATCH_FILE)
+  print 'about to patch with working_dir %s, patch: %s' % (options.working_dir,
+                                                           patch_path)
+  Patch(options.working_dir, patch_path)
+  Patch(options.working_dir, patch_path)
 
 
 # Build GTest and GMock, then install them into the toolchain.  Note that
@@ -186,15 +194,22 @@
 # extracts GTest and GMock, patches and builds them both, then installs them
 # into the toolchain specified in |options.toolchain|.
 def InstallTestingLibs(options):
+  print 'Making working directory.'
   MakeWorkingDir(options)
   try:
+    print 'Downloading and Extracting gtest.'
     DownloadAndExtractAll(options)
+    print 'Patching gtest.'
     PatchAll(options)
   except:
+    # TODO(mlinck) improve this error
+    print 'An Error occurred'
     return 1
 
+  print 'Building and installing gtest.'
   BuildAndInstallAll(options)
   # Clean up.
+  print 'Cleaning up gtest install files.'
   shutil.rmtree(options.working_dir, ignore_errors=True)
   return 0