Make it possible to run video_quality_loopback_test in swarming.

I made two changes to video_quality_loopback_test to make it possible
to run it on swarming.

1. We need to know the path to frame_analyzer when we're generating
   the build files, and it must be already present.
   I made frame_analyzer a resource, so it's downloaded to a known path
   before generating the build files.
2. The .zip files for apprtc and golang are downloaded and isolated.
   The script now extracts them and installs AppRTC.

Passing task:
 https://chromium-swarm.appspot.com/task?id=3b230bcc04128210

Bug: chromium:755660
Change-Id: I34090897402421d5b7e29f21fbed354551197f92
Reviewed-on: https://webrtc-review.googlesource.com/40920
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21716}

tools_webrtc/mb/gn_isolate_map.pyl

@@ -122,6 +122,12 @@
     "label": "//:video_engine_tests",
     "type": "console_test_launcher",
   },
+  "video_quality_loopback_test": {
+    "label": "//examples:AppRTCMobileTestStubbedVideoIO",
+    "type": "script",
+    "script": "//examples/androidtests/video_quality_loopback_test.py",
+    "args": ["."],
+  },
   "webrtc_nonparallel_tests": {
     "label": "//:webrtc_nonparallel_tests",
     "type": "non_parallel_console_test_launcher",

tools_webrtc/video_quality_toolchain/linux/frame_analyzer.sha1

@@ -0,0 +1 @@
+1f7b4528bbda3c8e2170b23b348b73b56df4e0d1