Recipes: make cwd default to slave_build

scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___builder.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___builder.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___builder.json b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___builder.json
index 91552deb413ce1fd7e87adfedd8c7daf3f41dcd3..8ce168878692d0dfaec039f249ecd7498e6b105c 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___builder.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___builder.json
@@ -5,6 +5,7 @@
       "-u",
       "[BUILD]\\scripts\\slave\\kill_processes.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "taskkill"
   },
   {
@@ -31,6 +32,7 @@
       "--no_shallow",
       "--output_manifest"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -63,6 +65,7 @@
       "[DEPOT_TOOLS]\\gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "target_arch=ia32 v8_target_arch=ia32",
       "GYP_MSVS_VERSION": "2013"
@@ -75,6 +78,7 @@
       "-u",
       "[BUILD]\\scripts\\slave\\cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -90,6 +94,7 @@
       "vs",
       "--"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -109,10 +114,12 @@
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"master\", \"buildername\": \"V8 Win32 - 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": [
       {