WebAPK: Save TabState for WebappManagedActivities and WebApkManagedActivities in different director…

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkManagedActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkManagedActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkManagedActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkManagedActivity.java
index a2c2be97383174e685237b3876c3ae389c16bd6f..1d9bdcfa69def66b3a9c61acf7d4580528dd58c1 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkManagedActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkManagedActivity.java
@@ -4,6 +4,8 @@
 
 package org.chromium.chrome.browser.webapps;
 
+import org.chromium.webapk.lib.common.WebApkConstants;
+
 /**
  * Type of WebApkActivity and it is targeted on Android versions older than L, similar to
  * WebappManagedActivity for WebappActivity.
@@ -26,7 +28,7 @@ public abstract class WebApkManagedActivity extends WebApkActivity {
 
     @Override
     protected String getActivityId() {
-        return String.valueOf(mActivityIndex);
+        return WebApkConstants.WEBAPK_ID_PREFIX + String.valueOf(mActivityIndex);
     }
 
     /**