Accept the Android SDK license on Linux

Change-Id: I8a898426ec22ec4a6b0ed024d46c97db174836a5
diff --git a/gce/linux-android.sh b/gce/linux-android.sh
index 1fe453e..3a6e225 100644
--- a/gce/linux-android.sh
+++ b/gce/linux-android.sh
@@ -45,7 +45,7 @@
 # specifically relies on one of them. extras;android;m2repository is necessary
 # for tests of our support library integration.
 # This should be kept in sync with mac/mac-android.sh.
-tools/bin/sdkmanager \
+yes | tools/bin/sdkmanager \
   "platform-tools" \
   "build-tools;26.0.1" \
   "platforms;android-24" \