webrtc: run tests in the checkout directory

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

Index: scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_rel.json
diff --git a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_rel.json b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_rel.json
index 28c9290f395514f54d21e9b8af733ebff23e0e70..47cff585942e3ace318aba0216666c014235918b 100644
--- a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_rel.json
+++ b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_linux_rel.json
@@ -262,7 +262,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/audio_decoder_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "audio_decoder_unittests"
   },
   {
@@ -288,7 +288,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/common_audio_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "common_audio_unittests"
   },
   {
@@ -314,7 +314,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/common_video_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "common_video_unittests"
   },
   {
@@ -340,7 +340,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/modules_tests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "modules_tests"
   },
   {
@@ -366,7 +366,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/modules_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "modules_unittests"
   },
   {
@@ -392,7 +392,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/peerconnection_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "peerconnection_unittests"
   },
   {
@@ -418,7 +418,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/rtc_media_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "rtc_media_unittests"
   },
   {
@@ -444,7 +444,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/rtc_pc_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "rtc_pc_unittests"
   },
   {
@@ -470,7 +470,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/rtc_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "rtc_unittests"
   },
   {
@@ -496,7 +496,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/system_wrappers_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "system_wrappers_unittests"
   },
   {
@@ -522,7 +522,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/test_support_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "test_support_unittests"
   },
   {
@@ -548,7 +548,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/tools_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "tools_unittests"
   },
   {
@@ -574,7 +574,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/video_engine_tests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "video_engine_tests"
   },
   {
@@ -600,7 +600,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/voice_engine_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "voice_engine_unittests"
   },
   {
@@ -626,7 +626,7 @@
       "[BUILDER_CACHE]/linux_rel/src/out/Release/xmllite_xmpp_unittests",
       "--"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "xmllite_xmpp_unittests"
   },
   {
@@ -651,7 +651,7 @@
       "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "webrtc_nonparallel_tests"
     ],
-    "cwd": "[BUILDER_CACHE]/linux_rel",
+    "cwd": "[BUILDER_CACHE]/linux_rel/src",
     "name": "webrtc_nonparallel_tests"
   },
   {