[Android] Focus/Blur contents when window focus changes

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java

 // Copyright 2015 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.chrome.browser;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.SearchManager;
@@ skipping 814 matching lines @@
 
     @Override
     public void onResumeWithNative() {
         super.onResumeWithNative();
         markSessionResume();
         RecordUserAction.record("MobileComeToForeground");
 
         if (getActivityTab() != null) {
             LaunchMetrics.commitLaunchMetrics(getActivityTab().getWebContents());
         }
+        ContentViewCore cvc = getContentViewCore();
+        if (cvc != null) cvc.onResume();
         FeatureUtilities.setCustomTabVisible(isCustomTab());
         FeatureUtilities.setIsInMultiWindowMode(
                 MultiWindowUtils.getInstance().isInMultiWindowMode(this));
 
         VideoPersister.getInstance().cleanup(this);
         VrShellDelegate.maybeRegisterVREntryHook(this);
     }
 
     @Override
     protected void onUserLeaveHint() {
         super.onUserLeaveHint();
         VideoPersister.getInstance().attemptPersist(this);
     }
 
     @Override
     public void onPauseWithNative() {
         RecordUserAction.record("MobileGoToBackground");
         Tab tab = getActivityTab();
-        if (tab != null) {
-            getTabContentManager().cacheTabThumbnail(tab);
-        }
+        if (tab != null) getTabContentManager().cacheTabThumbnail(tab);
+        ContentViewCore cvc = getContentViewCore();
+        if (cvc != null) cvc.onPause();
         VrShellDelegate.maybeUnregisterVREntryHook(this);
         markSessionEnd();
         super.onPauseWithNative();
     }
 
     @Override
     public void onStopWithNative() {
         Tab tab = getActivityTab();
         if (tab != null && !hasWindowFocus()) tab.onActivityHidden();
         if (mAppMenuHandler != null) mAppMenuHandler.hideAppMenu();
@@ skipping 1300 matching lines @@
      * draw over VR contents should be hidden in this call.
      */
     public void onEnterVR() {}
 
     /**
      * Called when VR mode using this activity is exited. Any state set for VR should be restored
      * in this call, including showing 2D UI that was hidden.
      */
     public void onExitVR() {}
 }