Recipes: make cwd default to slave_build

scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___custom_snapshot___debug_builder.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___custom_snapshot___debug_builder.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___custom_snapshot___debug_builder.json b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___custom_snapshot___debug_builder.json
index 7e5e61d7d52ae875f07f9a370d85663deb205bd5..931ec74777a96d493be8746c9592c03714a9df6a 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___custom_snapshot___debug_builder.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___custom_snapshot___debug_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": {
       "GYP_DEFINES": "embed_script='[SLAVE_BUILD]/v8/test/mjsunit/mjsunit.js' gomadir='[BUILD]/goma' target_arch=x64 use_goma=1 v8_enable_slow_dchecks=1 v8_optimized_debug=1 v8_target_arch=x64"
     },
@@ -66,6 +68,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -85,6 +88,7 @@
       "[BUILD]/goma",
       "--"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -104,10 +108,12 @@
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"master\", \"buildername\": \"V8 Linux64 - custom snapshot - debug 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": [
       {