Avoid computing patch_root in get_files_affected_by_patch.

recipe_modules/gclient/example.expected/tryserver_win.json

Index: recipe_modules/gclient/example.expected/tryserver_win.json
diff --git a/recipe_modules/gclient/example.expected/tryserver.json b/recipe_modules/gclient/example.expected/tryserver_win.json
similarity index 74%
copy from recipe_modules/gclient/example.expected/tryserver.json
copy to recipe_modules/gclient/example.expected/tryserver_win.json
index dd0061fe618850881c6eae57a5f3b15b4ba2b86a..3bd0fc9648c3637615856407df6d20649454a738 100644
--- a/recipe_modules/gclient/example.expected/tryserver.json
+++ b/recipe_modules/gclient/example.expected/tryserver_win.json
@@ -3,13 +3,13 @@
     "cmd": [
       "python",
       "-u",
-      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "config",
       "--spec",
       "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient setup"
   },
@@ -17,12 +17,12 @@
     "cmd": [
       "python",
       "-u",
-      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "sync",
       "--verbose",
       "--with_branch_heads",
       "--nohooks",
-      "-j8",
+      "-j2",
       "--reset",
       "--force",
       "--upstream",
@@ -34,7 +34,7 @@
       "/path/to/tmp/json"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient sync",
     "~followup_annotations": [
@@ -52,7 +52,7 @@
     "cmd": [
       "python",
       "-u",
-      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "recurse",
       "git",
       "config",
@@ -60,7 +60,7 @@
       "local_bot"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient recurse (git config user.name)"
   },
@@ -68,7 +68,7 @@
     "cmd": [
       "python",
       "-u",
-      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "recurse",
       "git",
       "config",
@@ -76,22 +76,44 @@
       "local_bot@example.com"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient recurse (git config user.email)"
   },
   {
     "cmd": [
+      "RECIPE_PACKAGE_REPO[depot_tools]\\bootstrap\\win\\win_tools.bat"
+    ],
+    "cwd": "RECIPE_PACKAGE_REPO[depot_tools]",
+    "name": "ensure git tooling on windows"
+  },
+  {
+    "cmd": [
+      "RECIPE_PACKAGE_REPO[depot_tools]\\git.bat",
+      "diff",
+      "--cached",
+      "--name-only"
+    ],
+    "cwd": "[ROOT]\\src",
+    "name": "git diff to analyze patch",
+    "stdout": "/path/to/tmp/",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@files@src/foo.cc@@@",
+      "@@@STEP_LOG_END@files@@@"
+    ]
+  },
+  {
+    "cmd": [
       "python",
       "-u",
-      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "config",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'WebKit', 'safesync_url': 'https://blink-status.appspot.com/lkgr', 'url': 'svn://svn.chromium.org/blink/trunk'}]"
     ],
-    "cwd": "[SLAVE_BUILD]/src/third_party",
+    "cwd": "[SLAVE_BUILD]\\src\\third_party",
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "[spec: WebKit] gclient setup"
   },
@@ -99,18 +121,18 @@
     "cmd": [
       "python",
       "-u",
-      "[BUILD]/scripts/slave/gclient_safe_revert.py",
+      "[BUILD]\\scripts\\slave\\gclient_safe_revert.py",
       ".",
-      "[DEPOT_TOOLS]/gclient"
+      "[DEPOT_TOOLS]\\gclient.bat"
     ],
-    "cwd": "[SLAVE_BUILD]/src/third_party",
+    "cwd": "[SLAVE_BUILD]\\src\\third_party",
     "name": "[spec: WebKit] gclient revert"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "sync",
       "--nohooks",
       "--force",
@@ -122,9 +144,9 @@
       "--output-json",
       "/path/to/tmp/json"
     ],
-    "cwd": "[SLAVE_BUILD]/src/third_party",
+    "cwd": "[SLAVE_BUILD]\\src\\third_party",
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "[spec: WebKit] gclient sync",
     "~followup_annotations": [
@@ -169,11 +191,11 @@
     "cmd": [
       "python",
       "-u",
-      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "runhooks"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },