[Android WebAPK] Make webapk_installer.cc return proto as base64 string

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

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkUpdateManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkUpdateManager.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkUpdateManager.java
index 1632c42482f9883feb5bb024a5cb932ee6257e70..fa6482f79dc0e39043d5dca92ec590bca6aa9cae 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkUpdateManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkUpdateManager.java
@@ -65,9 +65,9 @@ public class WebApkUpdateManager implements WebApkUpdateDataFetcher.Observer {
      */
     private static class PendingUpdate {
         public WebApkInfo mUpdateInfo;
-        byte[] mSerializedProto;
+        String mSerializedProto;
 
-        public PendingUpdate(WebApkInfo info, byte[] serializedProto) {
+        public PendingUpdate(WebApkInfo info, String serializedProto) {
             mUpdateInfo = info;
             mSerializedProto = serializedProto;
         }
@@ -201,9 +201,9 @@ public class WebApkUpdateManager implements WebApkUpdateDataFetcher.Observer {
             i++;
         }
 
-        Callback<byte[]> callback = new Callback<byte[]>() {
+        Callback<String> callback = new Callback<String>() {
             @Override
-            public void onResult(byte[] result) {
+            public void onResult(String result) {
                 scheduleUpdate(info, result);
             }
         };
@@ -218,7 +218,7 @@ public class WebApkUpdateManager implements WebApkUpdateDataFetcher.Observer {
      * Sends update request to WebAPK Server if the WebAPK is running in the background; caches the
      * fetched WebApkInfo otherwise.
      */
-    protected void scheduleUpdate(WebApkInfo info, byte[] serializedProto) {
+    protected void scheduleUpdate(WebApkInfo info, String serializedProto) {
         int numberOfUpdateRequests = mStorage.getUpdateRequests();
         boolean forceUpdateNow =  numberOfUpdateRequests >= MAX_UPDATE_ATTEMPTS;
         if (!isInForeground() || forceUpdateNow) {
@@ -243,7 +243,7 @@ public class WebApkUpdateManager implements WebApkUpdateDataFetcher.Observer {
     /**
      * Sends update request to the WebAPK Server and cleanup.
      */
-    private void updateAsync(WebApkInfo info, byte[] serializedProto) {
+    private void updateAsync(WebApkInfo info, String serializedProto) {
         updateAsyncImpl(info, serializedProto);
         mStorage.resetUpdateRequests();
         mPendingUpdate = null;
@@ -252,7 +252,7 @@ public class WebApkUpdateManager implements WebApkUpdateDataFetcher.Observer {
     /**
      * Sends update request to the WebAPK Server.
      */
-    protected void updateAsyncImpl(WebApkInfo info, byte[] serializedProto) {
+    protected void updateAsyncImpl(WebApkInfo info, String serializedProto) {
         if (info == null || serializedProto == null) {
             return;
         }
@@ -404,7 +404,7 @@ public class WebApkUpdateManager implements WebApkUpdateDataFetcher.Observer {
             String badgeIconUrl, Bitmap badgeIcon, String[] iconUrls, String[] iconHashes,
             int displayMode, int orientation, long themeColor, long backgroundColor,
             String manifestUrl, String webApkPackage, int webApkVersion, boolean isManifestStale,
-            Callback<byte[]> callback);
+            Callback<String> callback);
     private static native void nativeUpdateWebApk(String webApkPackage, String startUrl,
-            String shortName, byte[] serializedProto, WebApkUpdateCallback callback);
+            String shortName, String serializedProto, WebApkUpdateCallback callback);
 }