WebRTC: Add trybot for iOS SDK Framework build.

scripts/slave/recipes/webrtc/ios_api_framework.expected/trybot_biuld.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)@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"Mac OS X Version\": \"1.2.3\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"Xcode Build Version\": \"5D342509a\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"Xcode SDKs\": [@@@",
       "@@@STEP_LOG_LINE@json.output@    \"fake sdk 1.0\", @@@",
       "@@@STEP_LOG_LINE@json.output@    \"fake sdk 1.1\", @@@",
       "@@@STEP_LOG_LINE@json.output@    \"fake sdk 2.0\"@@@",
       "@@@STEP_LOG_LINE@json.output@  ], @@@",
       "@@@STEP_LOG_LINE@json.output@  \"Xcode Version\": \"6.7.8\"@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
-      "client.webrtc.fyi",
+      "tryserver.webrtc",
       "--builder",
-      "iOS API Framework Builder",
+      "ios_api_framework",
       "--slave",
       "TestSlavename",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/external/webrtc'}, {'deps_file': 'DEPS', 'managed': True, 'name': 'webrtc-limited', 'url': 'https://chrome-internal.googlesource.com/chrome/deps/webrtc-limited'}]\ntarget_os = ['ios', 'mac']",
       "--root",
       "src",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\"}",
       "--git-cache-dir",
       "[GIT_CACHE]",
+      "--issue",
+      "12853011",
+      "--patchset",
+      "1",
+      "--rietveld_server",
+      "https://codereview.chromium.org",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "src@HEAD",
       "--output_manifest"
     ],
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "bot_update",
@@ skipping 33 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "[SLAVE_BUILD]/src/webrtc/build/ios/build_ios_libs.sh",
-      "-c"
-    ],
-    "cwd": "[SLAVE_BUILD]/src",
-    "name": "cleanup"
-  },
-  {
-    "cmd": [
-      "[SLAVE_BUILD]/src/webrtc/build/ios/build_ios_libs.sh",
       "-r",
       "170242"
     ],
     "cwd": "[SLAVE_BUILD]/src",
-    "name": "build",
-    "~followup_annotations": [
-      "step returned non-zero exit code: 1",
-      "@@@STEP_FAILURE@@@"
-    ]
+    "name": "build"
   },
   {
     "name": "$result",
-    "reason": "Step('build') failed with return_code 1",
-    "status_code": 1
+    "recipe_result": null,
+    "status_code": 0
   }
 ]