Recipes: make cwd default to slave_build

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_chrome_Google_Chrome_Mac.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_chrome_Google_Chrome_Mac.json b/scripts/slave/recipes/chromium.expected/full_chromium_chrome_Google_Chrome_Mac.json
index 62a92d2c02b876638fa039120f1c183da542310f..42343bd4b1072c67bd845b65d0ab2bd95c3a6a21 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_chrome_Google_Chrome_Mac.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_chrome_Google_Chrome_Mac.json
@@ -21,6 +21,7 @@
       "--revision",
       "src@HEAD"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -67,6 +68,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "branding=Chrome buildtype=Official clang=1 component=static_library gomadir='[BUILD]/goma' target_arch=x64 use_goma=1"
     },
@@ -80,6 +82,7 @@
       "[SLAVE_BUILD]/src/testing/buildbot/chromium.chrome.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read test spec",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: [SLAVE_BUILD]/src/testing/buildbot/chromium.chrome.json@@@",
@@ -102,6 +105,7 @@
       "--properties",
       "{\"buildername\": \"Google Chrome Mac\", \"buildnumber\": 571, \"mastername\": \"chromium.chrome\", \"slavename\": \"TestSlavename\", \"target_platform\": \"mac\"}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "get compile targets for scripts",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
@@ -114,6 +118,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -136,6 +141,7 @@
       "--clobber",
       "--"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   }
 ]