Bug 1085620 part5: Support emulator builds in trygraph. r=lightsofapollo

Emulator tasks have some additional parameters not found in other
tasks. Therefore, builds can have an 'additional-parameters' field in
which specific task template replacements can be passed to trygraph.
This field is optional.

Moreover, the syntax for job_flags.yml builds was changed a bit.
Now, instead of:

builds:
  <platform>:
    types:
      opt: <task>
      debug: <task>

The syntax is:

builds:
  <platform>:
    types:
      opt:
        task: <task>
        additional-parameters:
          <parameter 1>: <value>
          <parameter 2>: <value>
          ...
      debug:
        task: <task>
        additional-parameters:
          <parameter 1>: <value>
          <parameter 2>: <value>
          ...

--HG--
extra : rebase_source : 6c9d7a814d5f7ea56373a4b6b0e05c8d14e9dd5f
extra : source : 3b199b4440826312f0695f81eaa6c6e6abeb621f

testing/taskcluster/job_flags.yml

@@ -54,13 +54,26 @@ builds:
     platforms:
       - b2g
     types:
-      opt: tasks/builds/b2g_desktop.yml
-      debug: tasks/builds/b2g_desktop_debug.yml
+      opt:
+        task: tasks/builds/b2g_desktop.yml
+      debug:
+        task: tasks/builds/b2g_desktop_debug.yml
   linux64-mulet:
     platforms:
       - Mulet Linux
     types:
-      opt: tasks/builds/mulet_linux.yml
+      opt:
+        task: tasks/builds/mulet_linux.yml
+  emulator-kk:
+    platfoms:
+      - b2g
+    types:
+      opt:
+        task: tasks/builds/b2g_emulator.yml
+        additional-parameters:
+          debug: 0
+          b2g-config: 'emulator-kk'
+          build-type: Opt
 
 # Test section covers the -u options in the try flags
 tests:

testing/taskcluster/mach_commands.py

@@ -139,7 +139,8 @@ class TryGraph(object):
                 "docker-worker:cache:sources-gaia",
                 "docker-worker:cache:build-b2g-desktop-objects",
                 "docker-worker:cache:build-mulet-linux-objects",
-                "docker-worker:cache:tooltool-cache"
+                "docker-worker:cache:tooltool-cache",
+                "docker-worker:cache:build-emulator-objects"
             ]
 
             # XXX: This is a hack figure out how to do this correctly or sanely
@@ -165,7 +166,7 @@ class TryGraph(object):
             }
 
         for build in job_graph:
-            build_parameters = copy.copy(parameters)
+            build_parameters = dict(parameters, **build['additional-parameters'])
             build_parameters['build_slugid'] = slugid()
             build_task = import_yaml(build['task'], build_parameters)
 

testing/taskcluster/taskcluster_graph/commit_parser.py

@@ -163,14 +163,21 @@ def parse_commit(message, jobs):
             if build_type not in platform_builds['types']:
                 continue
 
-            build_task = platform_builds['types'][build_type]
+            platform_build = platform_builds['types'][build_type]
+            build_task = platform_build['task']
+
+            if 'additional-parameters' in platform_build:
+                additional_parameters = platform_build['additional-parameters']
+            else:
+                additional_parameters = {}
 
             # Node for this particular build type
             result.append({
                 'task': build_task,
                 'dependents': extract_tests_from_platform(
                     jobs['tests'], platform_builds, build_task, tests
-                )
+                ),
+                'additional-parameters': additional_parameters
             })
 
     return result