Revert Revert of Start calling show/hide onStart/onStop in DocumentActivity)

chrome/android/javatests/src/org/chromium/chrome/browser/ChromeActivityTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/ChromeActivityTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/ChromeActivityTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/ChromeActivityTest.java
index a9aa061bb180d0b8a5fd615a2b5d212f80642ad8..95f271796b228ef088c040e0cd05dbe3876545bc 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/ChromeActivityTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/ChromeActivityTest.java
@@ -65,6 +65,12 @@ public class ChromeActivityTest extends ChromeTabbedActivityTestBase {
                 getActivity().onStop();
             }
         });
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                getActivity().onWindowFocusChanged(false);
+            }
+        });
         // Verify that both Tabs are hidden.
         assertTrue(tabs[0].isHidden());
         assertTrue(tabs[1].isHidden());
@@ -73,6 +79,12 @@ public class ChromeActivityTest extends ChromeTabbedActivityTestBase {
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
+                getActivity().onWindowFocusChanged(true);
+            }
+        });
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
                 getActivity().onStart();
             }
         });