Add GetExplicitPassphraseTime() JNI call.

chrome/android/java/src/org/chromium/chrome/browser/sync/ProfileSyncService.java

Index: chrome/android/java/src/org/chromium/chrome/browser/sync/ProfileSyncService.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/sync/ProfileSyncService.java b/chrome/android/java/src/org/chromium/chrome/browser/sync/ProfileSyncService.java
index d47f8e0547ccdbe4b665ac18dce91019180169f3..f23c1f4b28c9d452f3272d77bf8100a24c2f7fa2 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/sync/ProfileSyncService.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/sync/ProfileSyncService.java
@@ -229,6 +229,14 @@ public class ProfileSyncService {
         return nativeHasExplicitPassphraseTime(mNativeProfileSyncServiceAndroid);
     }
 
+    /**
+     * Returns the current explicit passphrase time in milliseconds since epoch.
+     */
+    public long getExplicitPassphraseTime() {
+        assert isSyncInitialized();
+        return nativeGetExplicitPassphraseTime(mNativeProfileSyncServiceAndroid);
+    }
+
     public String getSyncEnterGooglePassphraseBodyWithDateText() {
         assert isSyncInitialized();
         return nativeGetSyncEnterGooglePassphraseBodyWithDateText(mNativeProfileSyncServiceAndroid);
@@ -574,6 +582,7 @@ public class ProfileSyncService {
     private native boolean nativeIsCryptographerReady(long nativeProfileSyncServiceAndroid);
     private native int nativeGetPassphraseType(long nativeProfileSyncServiceAndroid);
     private native boolean nativeHasExplicitPassphraseTime(long nativeProfileSyncServiceAndroid);
+    private native long nativeGetExplicitPassphraseTime(long nativeProfileSyncServiceAndroid);
     private native String nativeGetSyncEnterGooglePassphraseBodyWithDateText(
             long nativeProfileSyncServiceAndroid);
     private native String nativeGetSyncEnterCustomPassphraseBodyWithDateText(