webrtc: use correct cwd for running tests

scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_asan.json

Index: scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_asan.json
diff --git a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_asan.json b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_asan.json
index 58c2770c8ce67ec72515449be7ccbd195cbbbca1..c234d05c0f6778a7ca36b4f2021b4e76c4db6085 100644
--- a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_asan.json
+++ b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_asan.json
@@ -282,6 +282,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/audio_decoder_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "audio_decoder_unittests"
   },
   {
@@ -307,6 +308,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/common_audio_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "common_audio_unittests"
   },
   {
@@ -332,6 +334,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/common_video_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "common_video_unittests"
   },
   {
@@ -357,6 +360,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/modules_tests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "modules_tests"
   },
   {
@@ -382,6 +386,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/modules_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "modules_unittests"
   },
   {
@@ -407,6 +412,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/peerconnection_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "peerconnection_unittests"
   },
   {
@@ -432,6 +438,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/rtc_media_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "rtc_media_unittests"
   },
   {
@@ -457,6 +464,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/rtc_pc_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "rtc_pc_unittests"
   },
   {
@@ -482,6 +490,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/rtc_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "rtc_unittests"
   },
   {
@@ -507,6 +516,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/system_wrappers_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "system_wrappers_unittests"
   },
   {
@@ -532,6 +542,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/test_support_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "test_support_unittests"
   },
   {
@@ -557,6 +568,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/tools_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "tools_unittests"
   },
   {
@@ -582,6 +594,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/video_engine_tests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "video_engine_tests"
   },
   {
@@ -607,6 +620,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/voice_engine_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "voice_engine_unittests"
   },
   {
@@ -632,6 +646,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/xmllite_xmpp_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "xmllite_xmpp_unittests"
   },
   {
@@ -657,6 +672,7 @@
       "[BUILDER_CACHE]/mac_asan/src/out/Release/libjingle_peerconnection_objc_test.app/Contents/MacOS/libjingle_peerconnection_objc_test",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "libjingle_peerconnection_objc_test"
   },
   {
@@ -681,6 +697,7 @@
       "--enable-asan",
       "webrtc_nonparallel_tests"
     ],
+    "cwd": "[BUILDER_CACHE]/mac_asan",
     "name": "webrtc_nonparallel_tests"
   },
   {