Use MediaMetadataRetriever.setDataSource(Context, Uri) for "content" scheme.

content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java

 // Copyright 2013 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.content.browser;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.media.MediaMetadataRetriever;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
+import android.net.Uri;
 import android.os.ParcelFileDescriptor;
 import android.text.TextUtils;
 
 import org.chromium.base.Log;
 import org.chromium.base.PathUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 
 import java.io.File;
@@ skipping 198 matching lines @@
                 return false;
             }
             try {
                 configure(file.getAbsolutePath());
                 return true;
             } catch (RuntimeException e) {
                 Log.e(TAG, "Error configuring data source: %s", e.getMessage());
                 return false;
             }
         }
+        if (scheme.equals("content")) {
+            try {
+                configure(context, Uri.parse(uri.toString()));
+                return true;
+            } catch (RuntimeException e) {
+                Log.e(TAG, "Error configuring data source: %s", e.getMessage());

[qinmin, 2016/01/25 18:58:56]

nit: you can simply do Log.e(TAG, "Error configuring data source: %s", e);

[horo, 2016/01/25 22:58:41]

Done.

+                return false;
+            }
+        }
         if (uri.getPath() != null && uri.getPath().endsWith(".m3u8")) {
             // MediaMetadataRetriever does not work with HLS correctly.
             return false;
         }
         final String host = uri.getHost();
         if (!isLoopbackAddress(host) && !isNetworkReliable(context)) {
             Log.w(TAG, "non-file URI can't be read due to unsuitable network conditions");
             return false;
         }
         Map<String, String> headersMap = new HashMap<String, String>();
@@ skipping 149 matching lines @@
     @VisibleForTesting
     void configure(String url, Map<String, String> headers) {
         mRetriever.setDataSource(url, headers);
     }
 
     @VisibleForTesting
     void configure(String path) {
         mRetriever.setDataSource(path);
     }
 
+    void configure(Context context, Uri uri) {
+        mRetriever.setDataSource(context, uri);
+    }
+
     @VisibleForTesting
     String extractMetadata(int key) {
         return mRetriever.extractMetadata(key);
     }
 }