libyuv: Switch {client,tryserver}.libyuv to GN

scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_android_rel.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/runit.py",
       "--show-path",
       "python",
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/cleanup_temp.py"
     ],
@@ skipping 399 matching lines @@
       "@@@STEP_LOG_LINE@03e0363a003c6ad6: blacklisted@  \"serial\": \"03e0363a003c6ad6\", @@@",
       "@@@STEP_LOG_LINE@03e0363a003c6ad6: blacklisted@  \"usb_status\": true@@@",
       "@@@STEP_LOG_LINE@03e0363a003c6ad6: blacklisted@}@@@",
       "@@@STEP_LOG_END@03e0363a003c6ad6: blacklisted@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[SLAVE_BUILD]/src/out/Release/bin/run_yuv_unittest",
+      "[SLAVE_BUILD]/src/out/Release/bin/run_libyuv_unittest",
       "--blacklist-file",
       "[SLAVE_BUILD]/src/out/bad_devices.json",
       "--verbose",
       "--adb-path",
       "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools/adb"
     ],
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
-    "name": "yuv_unittest"
+    "name": "libyuv_unittest"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/daemonizer.py",
       "--action",
       "stop",
       "--pid-file-path",
       "/tmp/device_monitor.pid"
@@ skipping 83 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.remove(report)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]