Java code for fetching variations first run seed after receiving chrome.TOS_ACKED broadcast.

chrome/android/java/src/org/chromium/chrome/browser/firstrun/variations/VariationsSeedBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/firstrun/variations/VariationsSeedBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/firstrun/variations/VariationsSeedBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/firstrun/variations/VariationsSeedBridge.java
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index 0000000000000000000000000000000000000000..c68cd4dfb969d489a242134d17fae18a45f5c380
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/firstrun/variations/VariationsSeedBridge.java
@@ -0,0 +1,79 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.firstrun.variations;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+import android.util.Base64;
+
+import org.chromium.base.ThreadUtils;
+import org.chromium.base.annotations.CalledByNative;
+
+/**
+ * PrefServiceBridge is a singleton which provides access to some native preferences. Ideally
+ * preferences should be grouped with their relevant functionality but this is a grab-bag for other
+ * preferences.
+ */
+public final class VariationsSeedBridge {
+    private VariationsSeedBridge() {}
+
+    private static VariationsSeedBridge sInstance;
+
+    /**
+     * @return The singleton bridge object.
+     */
+    public static VariationsSeedBridge getInstance() {
+        ThreadUtils.assertOnUiThread();
+        if (sInstance == null) sInstance = new VariationsSeedBridge();
+        return sInstance;
+    }
+
+    /**
+     * @return Whether the preferences have been initialized.
+     */
+    public static boolean isInitialized() {
+        return sInstance != null;
+    }
+
+    // TODO(agulenko): Move this piece of code to a separate class.
+
+    private static final String VARIATIONS_FIRST_RUN_SEED_BASE64 = "variations_seed_base64";
+    private static final String VARIATIONS_FIRST_RUN_SEED_SIGNATURE = "variations_seed_signature";
+    private static final String VARIATIONS_FIRST_RUN_SEED_COUNTRY = "variations_seed_country";
+
+    private static String getVariationsFirstRunSeedPref(Context context, String prefName) {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+        return prefs.getString(prefName, "");
+    }
+
+    public static void setVariationsFirstRunSeed(
+            Context context, byte[] rawSeed, String signature, String country) {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+        prefs.edit()
+                .putString(VARIATIONS_FIRST_RUN_SEED_BASE64,
+                        Base64.encodeToString(rawSeed, Base64.NO_WRAP))
+                .putString(VARIATIONS_FIRST_RUN_SEED_SIGNATURE, signature)
+                .putString(VARIATIONS_FIRST_RUN_SEED_COUNTRY, country)
+                .apply();
+    }
+
+    @CalledByNative
+    private static byte[] getVariationsFirstRunSeedData(Context context) {
+        return Base64.decode(
+                getVariationsFirstRunSeedPref(context, VARIATIONS_FIRST_RUN_SEED_BASE64),
+                Base64.NO_WRAP);
+    }
+
+    @CalledByNative
+    private static String getVariationsFirstRunSeedSignature(Context context) {
+        return getVariationsFirstRunSeedPref(context, VARIATIONS_FIRST_RUN_SEED_SIGNATURE);
+    }
+
+    @CalledByNative
+    private static String getVariationsFirstRunSeedCountry(Context context) {
+        return getVariationsFirstRunSeedPref(context, VARIATIONS_FIRST_RUN_SEED_COUNTRY);
+    }
+}