Using copy_ex to copy assets

base/android/java/src/org/chromium/base/ApkAssets.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.base;
 
 import android.content.Context;
 import android.content.res.AssetFileDescriptor;
 import android.content.res.AssetManager;
 import android.util.Log;
@@ skipping 15 matching lines @@
     @CalledByNative
     public static long[] open(Context context, String fileName) {
         AssetFileDescriptor afd = null;
         try {
             AssetManager manager = context.getAssets();
             afd = manager.openNonAssetFd(fileName);
             return new long[] { afd.getParcelFileDescriptor().detachFd(),
                                 afd.getStartOffset(),
                                 afd.getLength() };
         } catch (IOException e) {
+            // TODO(michaelbai): Remove dump assets once crbug.com/547235 fixed.
+            try {
+                String[] assets = context.getAssets().list("");
+                StringBuffer sb = new StringBuffer("Dump assets(" + assets.length + "):\n");
+                for (String asset : assets) {
+                    sb.append(asset);
+                    sb.append("\n");
+                }
+                Log.e(LOGTAG, sb.toString());
+            } catch (IOException ioe) {
+                Log.e(LOGTAG, "Error while list assets: " + ioe);
+            }
+
             Log.e(LOGTAG, "Error while loading asset " + fileName + ": " + e);
             return new long[] {-1, -1, -1};
         } finally {
             try {
                 if (afd != null) {
                     afd.close();
                 }
             } catch (IOException e2) {
                 Log.e(LOGTAG, "Unable to close AssetFileDescriptor", e2);
             }
         }
     }
 }