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

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 502f24ce096deaff153c37cfc2969c425f86321b..a93bbb6a05cb82f8c320c80482c28a272a1056bf 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -1085,20 +1085,9 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
      * Called on the foreground tab when the Activity showing the Tab gets started. This is called
      * on both cold and warm starts.
      */
-    public void onActivityStart() {
-        onActivityStartInternal(true);
-    }
-
-    /**
-     * Called on the foreground tab when the Activity showing the Tab gets stopped.
-     */
-    public void onActivityStop() {
-        hide();
-    }
-
-    protected void onActivityStartInternal(boolean showNow) {
+    public void onActivityShown() {
         if (isHidden()) {
-            if (showNow) show(TabSelectionType.FROM_USER);
+            show(TabSelectionType.FROM_USER);
         } else {
             // The visible Tab's renderer process may have died after the activity was paused.
             // Ensure that it's restored appropriately.
@@ -1112,6 +1101,13 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
     }
 
     /**
+     * Called on the foreground tab when the Activity showing the Tab gets stopped.
+     */
+    public void onActivityHidden() {
+        hide();
+    }
+
+    /**
      * @return Whether the tab is ready to display or it should be faded in as it loads.
      */
     public boolean shouldStall() {