Add GetExplicitPassphraseTime() JNI call.

This change is in preparation for a bug fix in Chrome for Android.

BUG=419927

Review URL: https://codereview.chromium.org/630223003

Cr-Commit-Position: refs/heads/master@{#298896}

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

@@ -236,6 +236,14 @@ public boolean hasExplicitPassphraseTime() {
         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);
@@ -585,6 +593,7 @@ private native void nativeSetEncryptionPassphrase(
     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(

chrome/browser/sync/profile_sync_service_android.cc

@@ -257,6 +257,13 @@ jboolean ProfileSyncServiceAndroid::HasExplicitPassphraseTime(
   return !passphrase_time.is_null();
 }
 
+jlong ProfileSyncServiceAndroid::GetExplicitPassphraseTime(
+        JNIEnv* env, jobject) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  base::Time passphrase_time = sync_service_->GetExplicitPassphraseTime();
+  return passphrase_time.ToJavaTime();
+}
+
 ScopedJavaLocalRef<jstring>
     ProfileSyncServiceAndroid::GetSyncEnterGooglePassphraseBodyWithDateText(
         JNIEnv* env, jobject) {

chrome/browser/sync/profile_sync_service_android.h

@@ -112,6 +112,9 @@ class ProfileSyncServiceAndroid : public ProfileSyncServiceObserver {
   // Returns true if the current explicit passphrase time is defined.
   jboolean HasExplicitPassphraseTime(JNIEnv* env, jobject);
 
+  // Returns the current explicit passphrase time.
+  jlong GetExplicitPassphraseTime(JNIEnv* env, jobject);
+
   base::android::ScopedJavaLocalRef<jstring>
       GetSyncEnterGooglePassphraseBodyWithDateText(
           JNIEnv* env, jobject);