[Android] Focus/Blur contents when window focus changes

chrome/android/javatests/src/org/chromium/chrome/browser/ContentViewFocusTest.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.support.test.filters.MediumTest;
 import android.view.View;
 import android.view.View.OnFocusChangeListener;
 
 import org.chromium.base.ThreadUtils;
+import org.chromium.base.test.util.CallbackHelper;
 import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.FlakyTest;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.base.test.util.UrlUtils;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.compositor.layouts.LayoutManager;
 import org.chromium.chrome.browser.compositor.layouts.eventfilter.EdgeSwipeHandler;
 import org.chromium.chrome.browser.compositor.layouts.eventfilter.ScrollDirection;
 import org.chromium.chrome.test.ChromeTabbedActivityTestBase;
 import org.chromium.chrome.test.util.ChromeRestriction;
 import org.chromium.chrome.test.util.ChromeTabUtils;
 import org.chromium.chrome.test.util.OverviewModeBehaviorWatcher;
 import org.chromium.content.browser.test.util.Criteria;
 import org.chromium.content.browser.test.util.CriteriaHelper;
 import org.chromium.content.browser.test.util.TestTouchUtils;
+import org.chromium.content_public.browser.WebContentsObserver;
 
 import java.util.ArrayDeque;
 
 /**
  * Test suite for ContentView focus and its interaction with Tab switcher,
  * Tab swiping, etc.
  */
 public class ContentViewFocusTest extends ChromeTabbedActivityTestBase {
 
     private static final int WAIT_RESPONSE_MS = 2000;
 
     private final ArrayDeque<Boolean> mFocusChanges = new ArrayDeque<Boolean>();
 
+    private CallbackHelper mOnTitleUpdatedHelper;
+    private WebContentsObserver mObserver;
+    private String mTitle;
+
     private void addFocusChangedListener(View view) {
         view.setOnFocusChangeListener(new OnFocusChangeListener() {
             @Override
             public void onFocusChange(View v, boolean hasFocus) {
                 synchronized (mFocusChanges) {
                     mFocusChanges.add(Boolean.valueOf(hasFocus));
                     mFocusChanges.notify();
                 }
             }
         });
@@ skipping 119 matching lines @@
         // Hide the tab switcher
         tabSwitcherButton = getActivity().findViewById(R.id.tab_switcher_button);
         assertNotNull("'tab_switcher_button' view is not found.", tabSwitcherButton);
         singleClickView(getActivity().findViewById(R.id.tab_switcher_button));
         hideWatcher.waitForBehavior();
 
         assertTrue("Content view didn't regain focus", blockForFocusChanged());
         assertFalse("Unexpected focus change", haveFocusChanges());
     }
 
+    /**
+     * Verify ContentView window focus changes propagate to contents.
+     *
+     * @throws Exception
+     */
+    @MediumTest
+    public void testWindowFocusChangeTriggersBlur() throws Exception {
+        mOnTitleUpdatedHelper = new CallbackHelper();
+        mObserver = new WebContentsObserver(getActivity().getActivityTab().getWebContents()) {

[Sami, 2017/04/03 10:23:45]

nit: Looks like mObserver could be a local variable, and mOnTitleUpdatedHelper
could be a final local too.

[mthiesse, 2017/04/03 15:50:03]

Done.

+            @Override
+            public void titleWasSet(String title) {
+                mTitle = title;
+                mOnTitleUpdatedHelper.notifyCalled();
+            }
+        };
+        int callCount = mOnTitleUpdatedHelper.getCallCount();
+        String url = UrlUtils.getIsolatedTestFileUrl(
+                "chrome/test/data/android/content_view_focus/content_view_blur_focus.html");
+        loadUrl(url);
+        final View view = getActivity().getActivityTab().getContentViewCore().getContainerView();
+        mOnTitleUpdatedHelper.waitForCallback(callCount);
+        assertEquals("initial", mTitle);
+        callCount = mOnTitleUpdatedHelper.getCallCount();
+        ThreadUtils.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                view.onWindowFocusChanged(false);
+            }
+        });
+        mOnTitleUpdatedHelper.waitForCallback(callCount);
+        assertEquals("blurred", mTitle);
+        callCount = mOnTitleUpdatedHelper.getCallCount();
+        ThreadUtils.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                view.onWindowFocusChanged(true);
+            }
+        });
+        mOnTitleUpdatedHelper.waitForCallback(callCount);
+        assertEquals("focused", mTitle);
+        getActivity().getActivityTab().getWebContents().removeObserver(mObserver);
+    }
+
     @Override
     public void startMainActivity() throws InterruptedException {
         startMainActivityOnBlankPage();
     }
 }