Recipes: make cwd default to slave_build

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

Index: scripts/slave/recipes/blink_trybot.expected/full_tryserver_blink_linux_blink_dbg_pass.json
diff --git a/scripts/slave/recipes/blink_trybot.expected/full_tryserver_blink_linux_blink_dbg_pass.json b/scripts/slave/recipes/blink_trybot.expected/full_tryserver_blink_linux_blink_dbg_pass.json
index d43bb1adbef8984fe3216494faa2337a528bae16..42ce0443cbc5a7f5cd92afaa46580083e3f3991a 100644
--- a/scripts/slave/recipes/blink_trybot.expected/full_tryserver_blink_linux_blink_dbg_pass.json
+++ b/scripts/slave/recipes/blink_trybot.expected/full_tryserver_blink_linux_blink_dbg_pass.json
@@ -30,6 +30,7 @@
       "src/third_party/WebKit@HEAD",
       "--force"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -76,6 +77,7 @@
       "[SLAVE_BUILD]/src/tools/swarming_client/swarming.py",
       "--version"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "swarming.py --version",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
@@ -89,6 +91,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "component=shared_library dcheck_always_on=1 fastbuild=1 gomadir='[BUILD]/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1"
     },
@@ -103,6 +106,7 @@
       "[SLAVE_BUILD]/src/out/Debug",
       "--clean-isolated-files"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "clean isolated files"
   },
   {
@@ -123,6 +127,7 @@
       "--",
       "blink_tests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {
@@ -133,6 +138,7 @@
       "/path/to/tmp/",
       "[SLAVE_BUILD]/src/out/Debug/*.isolated.gen.json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "find isolated targets"
   },
   {
@@ -148,6 +154,7 @@
       "[SLAVE_BUILD]/src/out/Debug/dummy_target_1.isolated.gen.json",
       "[SLAVE_BUILD]/src/out/Debug/dummy_target_2.isolated.gen.json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "isolate tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -168,6 +175,7 @@
       "--target",
       "Debug"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "webkit_lint"
   },
   {
@@ -180,6 +188,7 @@
       "--target",
       "Debug"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "webkit_python_tests"
   },
   {
@@ -199,6 +208,7 @@
       "--build-number=571",
       "webkit_unit_tests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "webkit_unit_tests"
   },
   {
@@ -218,6 +228,7 @@
       "--build-number=571",
       "blink_platform_unittests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "blink_platform_unittests"
   },
   {
@@ -237,6 +248,7 @@
       "--build-number=571",
       "blink_heap_unittests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "blink_heap_unittests"
   },
   {
@@ -256,6 +268,7 @@
       "--build-number=571",
       "wtf_unittests"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "wtf_unittests"
   },
   {
@@ -290,6 +303,7 @@
       "--builder-name",
       "linux_blink_dbg"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "webkit_tests (with patch)",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>Total executed: 9001<br/>@@@"
@@ -315,6 +329,7 @@
       "--build-properties",
       "{\"blamelist\": [\"someone@chromium.org\"], \"branch\": \"\", \"buildername\": \"linux_blink_dbg\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.blink\", \"patch_project\": \"blink\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"blink_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": \"HEAD\", \"rietveld\": \"https://codereview.chromium.org\", \"slavename\": \"TestSlavename\", \"swarm_hashes\": {\"angle_unittests\": \"[dummy hash for angle_unittests]\", \"content_gl_tests\": \"[dummy hash for content_gl_tests]\", \"content_unittests\": \"[dummy hash for content_unittests]\", \"gl_tests\": \"[dummy hash for gl_tests]\", \"gles2_conform_test\": \"[dummy hash for gles2_conform_test]\", \"gpu_unittests\": \"[dummy hash for gpu_unittests]\", \"media_unittests\": \"[dummy hash for media_unittests]\", \"tab_capture_end2end_tests\": \"[dummy hash for tab_capture_end2end_tests]\", \"telemetry_gpu_test\": \"[dummy hash for telemetry_gpu_test]\"}, \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "archive_webkit_tests_results",
     "~followup_annotations": [
       "@@@STEP_LINK@layout_test_results@https://storage.googleapis.com/chromium-layout-test-archives/linux_blink_dbg/571/layout-test-results/results.html@@@",