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

mobile/android/base/java/org/mozilla/gecko/Experiments.java

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+/* 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;
+
+import android.content.Context;
+
+import android.util.Log;
+import android.text.TextUtils;
+
+import com.keepsafe.switchboard.Preferences;
+import com.keepsafe.switchboard.SwitchBoard;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * This class should reflect the experiment names found in the Switchboard experiments config here:
+ * https://github.com/mozilla-services/switchboard-experiments
+ */
+public class Experiments {
+    private static final String LOGTAG = "GeckoExperiments";
+
+    // Show a system notification linking to a "What's New" page on app update.
+    public static final String WHATSNEW_NOTIFICATION = "whatsnew-notification";
+
+    // Subscribe to known, bookmarked sites and show a notification if new content is available.
+    public static final String CONTENT_NOTIFICATIONS_12HRS = "content-notifications-12hrs";
+    public static final String CONTENT_NOTIFICATIONS_8AM = "content-notifications-8am";
+    public static final String CONTENT_NOTIFICATIONS_5PM = "content-notifications-5pm";
+
+    // Onboarding: "Features and Story". These experiments are determined
+    // on the client, they are not part of the server config.
+    public static final String ONBOARDING3_A = "onboarding3-a"; // Control: No first run
+    public static final String ONBOARDING3_B = "onboarding3-b"; // 4 static Feature + 1 dynamic slides
+    public static final String ONBOARDING3_C = "onboarding3-c"; // Differentiating features slides
+
+    // Synchronizing the catalog of downloadable content from Kinto
+    public static final String DOWNLOAD_CONTENT_CATALOG_SYNC = "download-content-catalog-sync";
+
+    // Promotion for "Add to homescreen"
+    public static final String PROMOTE_ADD_TO_HOMESCREEN = "promote-add-to-homescreen";
+
+    public static final String PREF_ONBOARDING_VERSION = "onboarding_version";
+
+    // Promotion to bookmark reader-view items after entering reader view three times (Bug 1247689)
+    public static final String TRIPLE_READERVIEW_BOOKMARK_PROMPT = "triple-readerview-bookmark-prompt";
+
+    // Only show origin in URL bar instead of full URL (Bug 1236431)
+    public static final String URLBAR_SHOW_ORIGIN_ONLY = "urlbar-show-origin-only";
+
+    // Show name of organization (EV cert) instead of full URL in URL bar (Bug 1249594).
+    public static final String URLBAR_SHOW_EV_CERT_OWNER = "urlbar-show-ev-cert-owner";
+
+    // Play HLS videos in a VideoView (Bug 1313391)
+    public static final String HLS_VIDEO_PLAYBACK = "hls-video-playback";
+
+    // Make new activity stream panel available (to replace top sites) (Bug 1313316)
+    public static final String ACTIVITY_STREAM = "activity-stream";
+
+    /**
+     * Returns if a user is in certain local experiment.
+     * @param experiment Name of experiment to look up
+     * @return returns value for experiment or false if experiment does not exist.
+     */
+    public static boolean isInExperimentLocal(Context context, String experiment) {
+        if (SwitchBoard.isInBucket(context, 0, 20)) {
+            return Experiments.ONBOARDING3_A.equals(experiment);
+        } else if (SwitchBoard.isInBucket(context, 20, 60)) {
+            return Experiments.ONBOARDING3_B.equals(experiment);
+        } else if (SwitchBoard.isInBucket(context, 60, 100)) {
+            return Experiments.ONBOARDING3_C.equals(experiment);
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Returns list of all active experiments, remote and local.
+     * @return List of experiment names Strings
+     */
+    public static List<String> getActiveExperiments(Context c) {
+        final List<String> experiments = new LinkedList<>();
+        experiments.addAll(SwitchBoard.getActiveExperiments(c));
+
+        // Add onboarding version.
+        final String onboardingExperiment = GeckoSharedPrefs.forProfile(c).getString(Experiments.PREF_ONBOARDING_VERSION, null);
+        if (!TextUtils.isEmpty(onboardingExperiment)) {
+            experiments.add(onboardingExperiment);
+        }
+
+        return experiments;
+    }
+
+    /**
+     * Sets an override to force an experiment to be enabled or disabled. This value
+     * will be read and used before reading the switchboard server configuration.
+     *
+     * @param c Context
+     * @param experimentName Experiment name
+     * @param isEnabled Whether or not the experiment should be enabled
+     */
+    public static void setOverride(Context c, String experimentName, boolean isEnabled) {
+        Log.d(LOGTAG, "setOverride: " + experimentName + " = " + isEnabled);
+        Preferences.setOverrideValue(c, experimentName, isEnabled);
+    }
+
+    /**
+     * Clears the override value for an experiment.
+     *
+     * @param c Context
+     * @param experimentName Experiment name
+     */
+    public static void clearOverride(Context c, String experimentName) {
+        Log.d(LOGTAG, "clearOverride: " + experimentName);
+        Preferences.clearOverrideValue(c, experimentName);
+    }
+}