Bug 1427750 - Run a few more android emulator test tasks on xlarge instances; r=jmaher

Android cppunit, test-verify, and mochitest-gpu have been running on lower end
aws instances. It is probably better to run all emulator tasks on xlarge.

taskcluster/ci/test/compiled.yml

@@ -22,6 +22,10 @@ cppunit:
     description: "CPP Unit Tests"
     suite: cppunittest
     treeherder-symbol: tc(Cpp)
+    instance-size:
+        by-test-platform:
+            android.*: xlarge
+            default: default
     run-on-projects:
         by-test-platform:
             windows10-64-asan/opt: []  # as an exception to windows.*

taskcluster/ci/test/misc.yml

@@ -57,6 +57,10 @@ test-verify:
     suite: test-verification
     treeherder-symbol: tc(TV)
     loopback-video: true
+    instance-size:
+        by-test-platform:
+            android.*: xlarge
+            default: default
     max-run-time: 5400
     allow-software-gl-layers: false
     run-on-projects:

taskcluster/ci/test/mochitest.yml

@@ -257,6 +257,10 @@ mochitest-gpu:
             .*-qr/.*: ['mozilla-central', 'autoland', 'mozilla-inbound', 'try']  # exclude beta and project branches
             default: built-projects
     loopback-video: true
+    instance-size:
+        by-test-platform:
+            android.*: xlarge
+            default: default
     virtualization: virtual-with-gpu
     e10s:
         by-test-platform: