Recipes: make cwd default to slave_build

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

Index: scripts/slave/recipes/chromium.expected/arm.json
diff --git a/scripts/slave/recipes/chromium.expected/arm.json b/scripts/slave/recipes/chromium.expected/arm.json
index f4d2bd04dea1d4635e16a65568b6711d0c151cae..94e9e23dcc44606cc9fbec9a6aeb15e1791e7d62 100644
--- a/scripts/slave/recipes/chromium.expected/arm.json
+++ b/scripts/slave/recipes/chromium.expected/arm.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_CROSSCOMPILE": "1",
       "GYP_DEFINES": "arm_float_abi=hard component=static_library target_arch=arm test_isolation_mode=prepare"
@@ -81,6 +83,7 @@
       "[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@@@",
@@ -120,6 +123,7 @@
       "--properties",
       "{\"buildername\": \"Linux ARM Cross-Compile\", \"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@{}@@@",
@@ -132,6 +136,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -149,6 +154,7 @@
       "browser_tests",
       "browser_tests_run"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -168,6 +174,7 @@
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"Linux ARM Cross-Compile\", \"buildnumber\": 571, \"mastername\": \"chromium.fyi\", \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "package build"
   },
   {
@@ -197,6 +204,7 @@
       "--gtest-filter",
       "*NaCl*.*"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "browser_tests"
   }
 ]