Fix screen flicker when resizing CRD window in split-screen mode

remoting/android/java/src/org/chromium/chromoting/Desktop.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.chromoting;
 
 import android.annotation.SuppressLint;
 import android.content.res.Configuration;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.support.v7.app.ActionBar.OnMenuVisibilityListener;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.MotionEvent;
@@ skipping 102 matching lines @@
         getSupportActionBar().setHomeActionContentDescription(R.string.disconnect_myself_button);
 
         // The action bar is already shown when the activity is started however calling the
         // function below will set our preferred system UI flags which will adjust the layout
         // size of the canvas and we can avoid an initial resize event.
         showSystemUi();
 
         View decorView = getWindow().getDecorView();
         decorView.setOnSystemUiVisibilityChangeListener(this);
 
+        // The background color is displayed when the user resizes the window in split-screen past
+        // the boundaries of the image we render.  The default background is white and we use black
+        // for our canvas, thus there is a visual artifact when we draw the canvas over the
+        // background.  Setting the background color to match our canvas will prevent the flash.
+        getWindow().setBackgroundDrawable(new ColorDrawable(Color.BLACK));

[Lambros, 2016/11/07 20:36:25]

Would Color.TRANSPARENT be better?

[joedow, 2016/11/07 21:12:44]

BLACK and TRANSPARENT have a similar effect on my test device (i.e. they both 
end up displayed as black).  I prefer the opaque color just to be explicit about
what we want.

+
         mActivityLifecycleListener = mClient.getCapabilityManager().onActivityAcceptingListener(
                 this, Capabilities.CAST_CAPABILITY);
         mActivityLifecycleListener.onActivityCreated(this, savedInstanceState);
 
         mInputMode = getInitialInputModeValue();
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
             attachSystemUiResizeListener();
         } else {
             mRemoteHostDesktop.setFitsSystemWindows(true);
@@ skipping 476 matching lines @@
     @Override
     public boolean dispatchKeyEvent(KeyEvent event) {
         if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
             mClient.destroy();
             return super.dispatchKeyEvent(event);
         }
 
         return mInjector.sendKeyEvent(event);
     }
 }