Merge pull request #2597 from lissyx/android-emulator

Use Xvfb for emulator

Author: lissyx

taskcluster/tc-tests-utils.sh

@@ -1571,9 +1571,12 @@ android_setup_emulator()
 
   avdmanager create avd --name "ds-pixel" --device 17 --package "system-images;${api_level};google_apis;${flavor}"
 
+  # Use xvfb because:
+  #  > emulator: INFO: QtLogger.cpp:68: Warning: could not connect to display  ((null):0, (null))
+
   # -accel on is needed otherwise it is too slow, but it will require KVM support exposed
   pushd ${ANDROID_SDK_HOME}
-    ./tools/emulator -verbose -avd ds-pixel -no-skin -no-audio -no-window -no-boot-anim -accel off &
+    xvfb-run ./tools/emulator -verbose -avd ds-pixel -no-skin -no-audio -no-window -no-boot-anim -accel off &
     emulator_rc=$?
     export ANDROID_DEVICE_EMULATOR=$!
   popd

taskcluster/test-android-opt-base.tyml

@@ -47,7 +47,7 @@ then:
       - $let:
           extraSystemSetup: { $eval: strip(str(build.system_setup)) }
         in: >
-          apt-get -qq update && apt-get -qq -y install git gnupg pixz sox sudo wget unzip software-properties-common &&
+          apt-get -qq update && apt-get -qq -y install git gnupg pixz sox sudo wget unzip software-properties-common xvfb &&
           add-apt-repository --yes ppa:openjdk-r/ppa && apt-get -qq update && DEBIAN_FRONTEND=noninteractive apt-get -qq -y --force-yes install openjdk-8-jdk && java -version && update-ca-certificates -f &&
           ${extraSystemSetup} &&
           adduser --system --home ${system.homedir.linux} ${system.username} &&