pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/base/java/org/mozilla/gecko/gcm/GcmInstanceIDListenerService.java

@@ -0,0 +1,35 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.gcm;
+
+import android.util.Log;
+
+import com.google.android.gms.iid.InstanceIDListenerService;
+
+import org.mozilla.gecko.push.PushService;
+import org.mozilla.gecko.util.ThreadUtils;
+
+/**
+ * This service is notified by the on-device Google Play Services library if an
+ * in-use token needs to be updated.  We simply pass through to AndroidPushService.
+ */
+public class GcmInstanceIDListenerService extends InstanceIDListenerService {
+    /**
+     * Called if InstanceID token is updated. This may occur if the security of
+     * the previous token had been compromised. This call is initiated by the
+     * InstanceID provider.
+     */
+    @Override
+    public void onTokenRefresh() {
+        Log.d("GeckoPushGCM", "Token refresh request received.  Processing on background thread.");
+        ThreadUtils.postToBackgroundThread(new Runnable() {
+            @Override
+            public void run() {
+                PushService.getInstance(GcmInstanceIDListenerService.this).onRefresh();
+            }
+        });
+    }
+}

mobile/android/base/java/org/mozilla/gecko/gcm/GcmMessageListenerService.java

@@ -0,0 +1,38 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.gcm;
+
+import android.os.Bundle;
+import android.util.Log;
+
+import com.google.android.gms.gcm.GcmListenerService;
+
+import org.mozilla.gecko.push.PushService;
+import org.mozilla.gecko.util.ThreadUtils;
+
+/**
+ * This service actually handles messages directed from the on-device Google
+ * Play Services package.  We simply route them to the AndroidPushService.
+ */
+public class GcmMessageListenerService extends GcmListenerService {
+    /**
+     * Called when message is received.
+     *
+     * @param from SenderID of the sender.
+     * @param bundle Data bundle containing message data as key/value pairs.
+     */
+    @Override
+    public void onMessageReceived(final String from, final Bundle bundle) {
+        Log.d("GeckoPushGCM", "Message received.  Processing on background thread.");
+        ThreadUtils.postToBackgroundThread(new Runnable() {
+            @Override
+            public void run() {
+                PushService.getInstance(GcmMessageListenerService.this).onMessageReceived(
+                        GcmMessageListenerService.this, bundle);
+            }
+        });
+    }
+}

mobile/android/base/java/org/mozilla/gecko/gcm/GcmTokenClient.java

@@ -0,0 +1,131 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.gcm;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.support.annotation.NonNull;
+import android.util.Log;
+
+import com.google.android.gms.common.ConnectionResult;
+import com.google.android.gms.common.GoogleApiAvailability;
+import com.google.android.gms.gcm.GoogleCloudMessaging;
+import com.google.android.gms.iid.InstanceID;
+
+import org.mozilla.gecko.GeckoSharedPrefs;
+import org.mozilla.gecko.push.Fetched;
+
+import java.io.IOException;
+
+/**
+ * Fetch and cache GCM tokens.
+ * <p/>
+ * GCM tokens are stable and long lived.  Google Play Services will periodically request that
+ * they are rotated, however: see
+ * <a href="https://developers.google.com/instance-id/guides/android-implementation">https://developers.google.com/instance-id/guides/android-implementation</a>.
+ * <p/>
+ * The GCM token is cached in the App-wide shared preferences.  There's no particular harm in
+ * requesting new tokens, so if the user clears the App data, that's fine -- we'll get a fresh
+ * token and Push will react accordingly.
+ */
+public class GcmTokenClient {
+    private static final String LOG_TAG = "GeckoPushGCM";
+
+    private static final String KEY_GCM_TOKEN = "gcm_token";
+    private static final String KEY_GCM_TOKEN_TIMESTAMP = "gcm_token_timestamp";
+
+    private final Context context;
+
+    public GcmTokenClient(Context context) {
+        this.context = context;
+    }
+
+    /**
+     * Check the device to make sure it has the Google Play Services APK.
+     * @param context Android context.
+     */
+    protected void ensurePlayServices(Context context) throws NeedsGooglePlayServicesException {
+        final GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
+        int resultCode = apiAvailability.isGooglePlayServicesAvailable(context);
+        if (resultCode != ConnectionResult.SUCCESS) {
+            Log.w(LOG_TAG, "This device does not support GCM! isGooglePlayServicesAvailable returned: " + resultCode);
+            Log.w(LOG_TAG, "isGooglePlayServicesAvailable message: " + apiAvailability.getErrorString(resultCode));
+            throw new NeedsGooglePlayServicesException(resultCode);
+        }
+    }
+
+    /**
+     * Get a GCM token (possibly cached).
+     *
+     * @param senderID to request token for.
+     * @param debug whether to log debug details.
+     * @return token and timestamp.
+     * @throws NeedsGooglePlayServicesException if user action is needed to use Google Play Services.
+     * @throws IOException if the token fetch failed.
+     */
+    public @NonNull Fetched getToken(@NonNull String senderID, boolean debug) throws NeedsGooglePlayServicesException, IOException {
+        ensurePlayServices(this.context);
+
+        final SharedPreferences sharedPrefs = GeckoSharedPrefs.forApp(context);
+        String token = sharedPrefs.getString(KEY_GCM_TOKEN, null);
+        long timestamp = sharedPrefs.getLong(KEY_GCM_TOKEN_TIMESTAMP, 0L);
+        if (token != null && timestamp > 0L) {
+            if (debug) {
+                Log.i(LOG_TAG, "Cached GCM token exists: " + token);
+            } else {
+                Log.i(LOG_TAG, "Cached GCM token exists.");
+            }
+            return new Fetched(token, timestamp);
+        }
+
+        Log.i(LOG_TAG, "Cached GCM token does not exist; requesting new token with sender ID: " + senderID);
+
+        final InstanceID instanceID = InstanceID.getInstance(context);
+        token = instanceID.getToken(senderID, GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
+        timestamp = System.currentTimeMillis();
+
+        if (debug) {
+            Log.i(LOG_TAG, "Got fresh GCM token; caching: " + token);
+        } else {
+            Log.i(LOG_TAG, "Got fresh GCM token; caching.");
+        }
+        sharedPrefs
+                .edit()
+                .putString(KEY_GCM_TOKEN, token)
+                .putLong(KEY_GCM_TOKEN_TIMESTAMP, timestamp)
+                .apply();
+
+        return new Fetched(token, timestamp);
+    }
+
+    /**
+     * Remove any cached GCM token.
+     */
+    public void invalidateToken() {
+        final SharedPreferences sharedPrefs = GeckoSharedPrefs.forApp(context);
+        sharedPrefs
+                .edit()
+                .remove(KEY_GCM_TOKEN)
+                .remove(KEY_GCM_TOKEN_TIMESTAMP)
+                .apply();
+    }
+
+    public class NeedsGooglePlayServicesException extends Exception {
+        private static final long serialVersionUID = 4132853166L;
+
+        private final int resultCode;
+
+        NeedsGooglePlayServicesException(int resultCode) {
+            super();
+            this.resultCode = resultCode;
+        }
+
+        public void showErrorNotification() {
+            final GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
+            apiAvailability.showErrorNotification(context, resultCode);
+        }
+    }
+}