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

components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedBridge.java

Index: components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedBridge.java
diff --git a/components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedBridge.java b/components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedBridge.java
new file mode 100644
index 0000000000000000000000000000000000000000..3af546bf3bf62115b4ff37c4ff207f4c58f6a54d
--- /dev/null
+++ b/components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedBridge.java
@@ -0,0 +1,60 @@
+// 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.components.variations.firstrun;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+import android.util.Base64;
+
+import org.chromium.base.annotations.CalledByNative;
+
+/**
+ * VariationsSeedBridge is a class which used to pass variations first run seed that was fetched
+ * before the actual Chrome first run to Chromium core. Class provides methods to store the seed
+ * in SharedPreferences and to get the seed from there. To store raw seed data class serializes
+ * byte[] to Base64 encoded string and decodes this string before passing to C++ side.
+ */
+public final class VariationsSeedBridge {
+    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, "");
+    }
+
+    /**
+     * Stores variations seed data (raw data, seed signature and country code) in SharedPreferences.
+     */
+    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);
+    }
+}