Bug 1343223 - Enable the mochitest-media suite for linux64-qr on the graphics branch. r=dustin

MozReview-Commit-ID: Jvd8sPVbDoI

--HG--
extra : rebase_source : efcc7de7065d4e6721f24749912ec8b4cde0ce4a

taskcluster/ci/test/test-sets.yml

@@ -86,6 +86,7 @@ qr-tests:
     - jsreftest
     - mochitest-a11y
     - mochitest-gpu
+    - mochitest-media
     - mochitest-webgl
     - reftest
     - reftest-no-accel

taskcluster/ci/test/tests.yml

@@ -791,6 +791,10 @@ mochitest-media:
             macosx64.*: 1
             default: 3
     docker-image: {"in-tree": "desktop1604-test"}
+    run-on-projects:
+        by-test-platform:
+            linux64-qr/.*: ['graphics']
+            default: ['all']
     mozharness:
         by-test-platform:
             android.*: