[Android] Focus/Blur contents when window focus changes

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
index 34621b16734f9d243607966e8d7b8179862fc541..03ebc29e985bcead1c6d4e6f381afafe6b13859d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
@@ -832,6 +832,8 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
         if (getActivityTab() != null) {
             LaunchMetrics.commitLaunchMetrics(getActivityTab().getWebContents());
         }
+        ContentViewCore cvc = getContentViewCore();
+        if (cvc != null) cvc.onResume();
         FeatureUtilities.setCustomTabVisible(isCustomTab());
         FeatureUtilities.setIsInMultiWindowMode(
                 MultiWindowUtils.getInstance().isInMultiWindowMode(this));
@@ -850,9 +852,9 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
     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();