Recipes: make cwd default to slave_build

scripts/slave/recipes/blink_trybot.expected/preamble_test_failure.json

Index: scripts/slave/recipes/blink_trybot.expected/preamble_test_failure.json
diff --git a/scripts/slave/recipes/blink_trybot.expected/preamble_test_failure.json b/scripts/slave/recipes/blink_trybot.expected/preamble_test_failure.json
index bd4b7e78611d892faacadcc334c42cc5f2cdb333..488d4ef676eacc53254260fc49deccc8715955f8 100644
--- a/scripts/slave/recipes/blink_trybot.expected/preamble_test_failure.json
+++ b/scripts/slave/recipes/blink_trybot.expected/preamble_test_failure.json
@@ -30,6 +30,7 @@
       "src/third_party/WebKit@HEAD",
       "--force"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -75,6 +76,7 @@
       "-9",
       "gnome-keyring-daemon"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "killall gnome-keyring-daemon"
   },
   {
@@ -84,6 +86,7 @@
       "[SLAVE_BUILD]/src/tools/swarming_client/swarming.py",
       "--version"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "swarming.py --version",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
@@ -97,6 +100,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "archive_gpu_tests=1 component=static_library dcheck_always_on=1 fastbuild=1 gomadir='[BUILD]/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1"
     },
@@ -111,6 +115,7 @@
       "[SLAVE_BUILD]/src/out/Release",
       "--clean-isolated-files"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "clean isolated files"
   },
   {
@@ -137,6 +142,7 @@
       "tab_capture_end2end_tests_run",
       "telemetry_gpu_test_run"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -147,6 +153,7 @@
       "/path/to/tmp/",
       "[SLAVE_BUILD]/src/out/Release/*.isolated.gen.json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "find isolated targets"
   },
   {
@@ -162,6 +169,7 @@
       "[SLAVE_BUILD]/src/out/Release/dummy_target_1.isolated.gen.json",
       "[SLAVE_BUILD]/src/out/Release/dummy_target_2.isolated.gen.json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "isolate tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -182,6 +190,7 @@
       "--target",
       "Release"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "webkit_lint"
   },
   {
@@ -194,6 +203,7 @@
       "--target",
       "Release"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "webkit_python_tests"
   },
   {
@@ -213,6 +223,7 @@
       "--build-number=571",
       "webkit_unit_tests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "webkit_unit_tests",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",
@@ -236,6 +247,7 @@
       "--build-number=571",
       "blink_platform_unittests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "blink_platform_unittests"
   },
   {
@@ -255,6 +267,7 @@
       "--build-number=571",
       "blink_heap_unittests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "blink_heap_unittests"
   },
   {
@@ -274,6 +287,7 @@
       "--build-number=571",
       "wtf_unittests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "wtf_unittests"
   },
   {
@@ -282,6 +296,7 @@
       "-u",
       "import sys; sys.exit(1)"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "Aborting due to failed build state",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@import sys; sys.exit(1)@@@",