Recipes: make cwd default to slave_build

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_fyi_Linux_Trusty__dbg_.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Linux_Trusty__dbg_.json b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Linux_Trusty__dbg_.json
index 588e45e4340beb268e3cc59846854421a6ca55a3..9cdcf54acbd7b2f8b6d9e88198da928a52cb560a 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Linux_Trusty__dbg_.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Linux_Trusty__dbg_.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": "component=shared_library gomadir='[BUILD]/goma' target_arch=x64 use_goma=1"
     },
@@ -80,6 +82,7 @@
       "[SLAVE_BUILD]/src/testing/buildbot/chromium.fyi.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read test spec",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: [SLAVE_BUILD]/src/testing/buildbot/chromium.fyi.json@@@",
@@ -102,6 +105,7 @@
       "--properties",
       "{\"buildername\": \"Linux Trusty (dbg)\", \"buildnumber\": 571, \"mastername\": \"chromium.fyi\", \"slavename\": \"TestSlavename\", \"target_platform\": \"linux\"}"
     ],
+    "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"
   },
   {
@@ -134,6 +139,7 @@
       "--",
       "all"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   }
 ]