Recipes: make cwd default to slave_build

scripts/slave/recipes/chromium.expected/full_chromium_webkit_Linux_ChromiumOS__Clang_dbg_.json

Index: scripts/slave/recipes/chromium.expected/full_chromium_webkit_Linux_ChromiumOS__Clang_dbg_.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_webkit_Linux_ChromiumOS__Clang_dbg_.json b/scripts/slave/recipes/chromium.expected/full_chromium_webkit_Linux_ChromiumOS__Clang_dbg_.json
index 00c7e3ec4714511d1881c3be8c2bf17459535866..5be95479ed8d153d5d5bd2d140c82d2765631b01 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_webkit_Linux_ChromiumOS__Clang_dbg_.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_webkit_Linux_ChromiumOS__Clang_dbg_.json
@@ -23,6 +23,7 @@
       "--revision",
       "src/third_party/WebKit@HEAD"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -69,6 +70,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "chromeos=1 clang=1 component=shared_library ffmpeg_branding=ChromeOS gomadir='[BUILD]/goma' proprietary_codecs=1 target_arch=x64 use_goma=1"
     },
@@ -82,6 +84,7 @@
       "[SLAVE_BUILD]/src/testing/buildbot/chromium.webkit.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read test spec",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: [SLAVE_BUILD]/src/testing/buildbot/chromium.webkit.json@@@",
@@ -104,6 +107,7 @@
       "--properties",
       "{\"buildername\": \"Linux ChromiumOS (Clang dbg)\", \"buildnumber\": 571, \"mastername\": \"chromium.webkit\", \"slavename\": \"TestSlavename\", \"target_platform\": \"linux\"}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "get compile targets for scripts",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
@@ -116,6 +120,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -168,6 +173,7 @@
       "url_unittests",
       "views_unittests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   }
 ]