Variations seed is pulled from the Java application on the first launch of Chrome

chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java
index c5c1564f934cc2c01e0cd420b0881b04861c3966..5209078c6cf73671297f00c41f2d51f5fb30b95a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java
@@ -219,6 +219,34 @@ public final class PrefServiceBridge {
         }
     }
 
+    // These constants must coincide with variations prefs name in Chromium core
+    // prefs::kVariationsSeedSignature and prefs::kVariationsCountry respectively

[Alexei Svitkine (slow), 2015/10/28 15:16:38]

Can we avoid the C++ code needing to know these internal pref names? I have a
suggestion for how to do that in a later comment.

[Alexander Agulenko, 2015/10/28 23:05:09]

Done.

+    public static final String VARIATIONS_FIRST_RUN_SEED_SIGNATURE = "variations_seed_signature";
+    public static final String VARIATIONS_FIRST_RUN_COUNTRY = "variations_country";
+
+    @CalledByNative
+    public static String getVariationsSeedPref(Context context, String prefName) {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+        return prefs.getString(prefName, new String());
+    }
+
+    public static void setVariationsSeedPref(Context context, String prefName, String data) {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+        prefs.edit().remove(prefName).apply();
+        prefs.edit().putString(prefName, data).apply();
+    }
+
+    private static byte[] sRawVariationsSeed;
+
+    @CalledByNative
+    public static byte[] getRawVariationsSeed(Context context) {
+        return sRawVariationsSeed;
+    }
+
+    public static void setRawVariationsSeed(Context context, byte[] rawSeed) {
+        sRawVariationsSeed = rawSeed;
+    }
+
     public boolean isAcceptCookiesEnabled() {
         return nativeGetAcceptCookiesEnabled();
     }