Prepare MediaDrmBridge to work with MediaCodecPlayer

media/base/android/java/src/org/chromium/media/MediaDrmBridge.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.media;
 
 import android.annotation.TargetApi;
 import android.media.MediaCrypto;
 import android.media.MediaDrm;
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Handler;
+import android.os.Looper;
 
 import org.chromium.base.Log;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 
 import java.io.BufferedInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
@@ skipping 179 matching lines @@
 
     @TargetApi(Build.VERSION_CODES.M)
     private MediaDrmBridge(UUID schemeUUID, long nativeMediaDrmBridge)
             throws android.media.UnsupportedSchemeException {
         mSchemeUUID = schemeUUID;
         mMediaDrm = new MediaDrm(schemeUUID);
 
         mNativeMediaDrmBridge = nativeMediaDrmBridge;
         assert isNativeMediaDrmBridgeValid();
 
-        mHandler = new Handler();
+        mHandler = new Handler(Looper.getMainLooper());
         mSessionIds = new HashMap<ByteBuffer, String>();
         mPendingCreateSessionDataQueue = new ArrayDeque<PendingCreateSessionData>();
         mResetDeviceCredentialsPending = false;
         mProvisioningPending = false;
 
         mMediaDrm.setOnEventListener(new EventListener());
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             mMediaDrm.setOnExpirationUpdateListener(new ExpirationUpdateListener(), null);
             mMediaDrm.setOnKeyStatusChangeListener(new KeyStatusChangeListener(), null);
         }
@@ skipping 901 matching lines @@
     private native void nativeOnSessionKeysChange(long nativeMediaDrmBridge, byte[] sessionId,
             Object[] keysInfo, boolean hasAdditionalUsableKey);
     private native void nativeOnSessionExpirationUpdate(
             long nativeMediaDrmBridge, byte[] sessionId, long expirationTime);
     private native void nativeOnLegacySessionError(
             long nativeMediaDrmBridge, byte[] sessionId, String errorMessage);
 
     private native void nativeOnResetDeviceCredentialsCompleted(
             long nativeMediaDrmBridge, boolean success);
 }