webrtc: run tests in the checkout directory

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

Index: scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_dbg.json
diff --git a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_dbg.json b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_dbg.json
index 250682b3dd73ec3989dfa574bbe7df7de375809e..b38c2d57d2893d9e437bc43ff8fe8ec22bb5e35b 100644
--- a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_dbg.json
+++ b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_dbg.json
@@ -281,7 +281,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/audio_decoder_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "audio_decoder_unittests"
   },
   {
@@ -306,7 +306,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/common_audio_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "common_audio_unittests"
   },
   {
@@ -331,7 +331,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/common_video_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "common_video_unittests"
   },
   {
@@ -356,7 +356,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/modules_tests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "modules_tests"
   },
   {
@@ -381,7 +381,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/modules_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "modules_unittests"
   },
   {
@@ -406,7 +406,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/peerconnection_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "peerconnection_unittests"
   },
   {
@@ -431,7 +431,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/rtc_media_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "rtc_media_unittests"
   },
   {
@@ -456,7 +456,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/rtc_pc_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "rtc_pc_unittests"
   },
   {
@@ -481,7 +481,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/rtc_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "rtc_unittests"
   },
   {
@@ -506,7 +506,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/system_wrappers_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "system_wrappers_unittests"
   },
   {
@@ -531,7 +531,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/test_support_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "test_support_unittests"
   },
   {
@@ -556,7 +556,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/tools_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "tools_unittests"
   },
   {
@@ -581,7 +581,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/video_engine_tests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "video_engine_tests"
   },
   {
@@ -606,7 +606,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/voice_engine_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "voice_engine_unittests"
   },
   {
@@ -631,7 +631,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/xmllite_xmpp_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "xmllite_xmpp_unittests"
   },
   {
@@ -656,7 +656,7 @@
       "[BUILDER_CACHE]/mac_dbg/src/out/Debug/libjingle_peerconnection_objc_test.app/Contents/MacOS/libjingle_peerconnection_objc_test",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "libjingle_peerconnection_objc_test"
   },
   {
@@ -680,7 +680,7 @@
       "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "webrtc_nonparallel_tests"
     ],
-    "cwd": "[BUILDER_CACHE]/mac_dbg",
+    "cwd": "[BUILDER_CACHE]/mac_dbg/src",
     "name": "webrtc_nonparallel_tests"
   },
   {