webrtc: run tests in the checkout directory

scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac64_debug.json

Index: scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac64_debug.json
diff --git a/scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac64_debug.json b/scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac64_debug.json
index 737eb7b1b5b8829df9e5e2454c0fd3a8502a1529..291486d6675538b9aff6dc6f099f0b8d735ad091 100644
--- a/scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac64_debug.json
+++ b/scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac64_debug.json
@@ -273,7 +273,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/audio_decoder_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "audio_decoder_unittests"
   },
   {
@@ -298,7 +298,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/common_audio_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "common_audio_unittests"
   },
   {
@@ -323,7 +323,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/common_video_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "common_video_unittests"
   },
   {
@@ -348,7 +348,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/modules_tests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "modules_tests"
   },
   {
@@ -373,7 +373,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/modules_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "modules_unittests"
   },
   {
@@ -398,7 +398,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/peerconnection_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "peerconnection_unittests"
   },
   {
@@ -423,7 +423,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/rtc_media_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "rtc_media_unittests"
   },
   {
@@ -448,7 +448,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/rtc_pc_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "rtc_pc_unittests"
   },
   {
@@ -473,7 +473,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/rtc_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "rtc_unittests"
   },
   {
@@ -498,7 +498,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/system_wrappers_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "system_wrappers_unittests"
   },
   {
@@ -523,7 +523,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/test_support_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "test_support_unittests"
   },
   {
@@ -548,7 +548,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/tools_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "tools_unittests"
   },
   {
@@ -573,7 +573,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/video_engine_tests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "video_engine_tests"
   },
   {
@@ -598,7 +598,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/voice_engine_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "voice_engine_unittests"
   },
   {
@@ -623,7 +623,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/xmllite_xmpp_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "xmllite_xmpp_unittests"
   },
   {
@@ -648,7 +648,7 @@
       "[BUILDER_CACHE]/Mac64_Debug/src/out/Debug/libjingle_peerconnection_objc_test.app/Contents/MacOS/libjingle_peerconnection_objc_test",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "libjingle_peerconnection_objc_test"
   },
   {
@@ -675,7 +675,7 @@
       "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "webrtc_nonparallel_tests"
     ],
-    "cwd": "[BUILDER_CACHE]/Mac64_Debug",
+    "cwd": "[BUILDER_CACHE]/Mac64_Debug/src",
     "name": "webrtc_nonparallel_tests"
   },
   {