WebRTC: Archive the WebRTC.dSYM dir in the zip archive

scripts/slave/recipes/webrtc/ios_api_framework.expected/build_ok.json

 [
   {
     "cmd": [
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/ios/host_info.py",
       "--json-file",
       "/path/to/tmp/json"
     ],
     "name": "host and tools info",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br />OS X 1.2.3, Xcode 6.7.8 (5D342509a)@@@",
@@ skipping 113 matching lines @@
     "cwd": "[BUILDER_CACHE]/iOS_API_Framework/src",
     "name": "build"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::zip]/resources/zip.py"
     ],
     "name": "zip archive",
-    "stdin": "{\"entries\": [{\"path\": \"[BUILDER_CACHE]/iOS_API_Framework/src/out_ios_libs/WebRTC.framework\", \"type\": \"dir\"}, {\"path\": \"[BUILDER_CACHE]/iOS_API_Framework/src/out_ios_libs/WebRTC.framework.dSYM\", \"type\": \"dir\"}], \"output\": \"[SLAVE_BUILD]/webrtc_ios_api_framework.zip\", \"root\": \"[BUILDER_CACHE]/iOS_API_Framework/src/out_ios_libs\"}"
+    "stdin": "{\"entries\": [{\"path\": \"[BUILDER_CACHE]/iOS_API_Framework/src/out_ios_libs/WebRTC.framework\", \"type\": \"dir\"}, {\"path\": \"[BUILDER_CACHE]/iOS_API_Framework/src/out_ios_libs/WebRTC.dSYM\", \"type\": \"dir\"}], \"output\": \"[SLAVE_BUILD]/webrtc_ios_api_framework.zip\", \"root\": \"[BUILDER_CACHE]/iOS_API_Framework/src/out_ios_libs\"}"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
       "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
       "-a",
       "public-read",
       "[SLAVE_BUILD]/webrtc_ios_api_framework.zip",
       "gs://chromium-webrtc/ios_api_framework/webrtc_ios_api_framework_170242.zip"
     ],
     "name": "gsutil upload",
     "~followup_annotations": [
       "@@@STEP_LINK@gsutil.upload@https://storage.googleapis.com/chromium-webrtc/ios_api_framework/webrtc_ios_api_framework_170242.zip@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]