Recipes: make cwd default to slave_build

scripts/slave/recipes/v8.expected/full_client_v8_V8_Arm___builder.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_V8_Arm___builder.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Arm___builder.json b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Arm___builder.json
index cfa071e7684d777607ed6f13959ae9e318096ad0..4e49ed2a1081a2eff2c7d0d974f0c2e2baaf7923 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Arm___builder.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Arm___builder.json
@@ -23,6 +23,7 @@
       "--no_shallow",
       "--output_manifest"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -55,6 +56,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CXX": "/usr/bin/arm-linux-gnueabihf-g++",
       "GYP_CROSSCOMPILE": "1",
@@ -69,6 +71,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -88,6 +91,7 @@
       "arm",
       "--"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -107,10 +111,12 @@
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"master\", \"buildername\": \"V8 Arm - builder\", \"buildnumber\": 571, \"mastername\": \"client.v8\", \"parent_buildername\": null, \"recipe\": \"v8\", \"revision\": \"20123\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "package build"
   },
   {
     "cmd": [],
+    "cwd": "[SLAVE_BUILD]",
     "name": "trigger",
     "trigger_specs": [
       {