Bug 1306933 - Support the 'Android 4.3' prettyname alias for trychooser, r=dustin

The trychooser website advertises 'Android 4.3' as the alias to choose Android
tests in [] syntax, but without support for that in taskcluster, someone who
wants both opt and debug tests would need to guess, with no support or
documentation, that they should use [Android 4.3,android-4.3-arm7-api-15]

MozReview-Commit-ID: 4rEKcvqAfDH

--HG--
extra : rebase_source : 336d3a787569e14e5ae8608902e6e557ef2ce6c3

taskcluster/taskgraph/try_option_syntax.py

@@ -126,6 +126,7 @@ UNITTEST_ALIASES = {
 UNITTEST_PLATFORM_PRETTY_NAMES = {
     'Ubuntu': ['linux', 'linux64'],
     'x64': ['linux64', 'linux64-asan'],
+    'Android 4.3': ['android-4.3-arm7-api-15'],
     # other commonly-used substrings for platforms not yet supported with
     # in-tree taskgraphs:
     # '10.10': [..TODO..],
@@ -133,7 +134,6 @@ UNITTEST_PLATFORM_PRETTY_NAMES = {
     # '10.6': [..TODO..],
     # '10.8': [..TODO..],
     # 'Android 2.3 API9': [..TODO..],
-    # 'Android 4.3 API15+': [..TODO..],
     # 'Windows 7':  [..TODO..],
     # 'Windows 7 VM': [..TODO..],
     # 'Windows 8':  [..TODO..],