Move setCoveredByChild methods to Tab.

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

 // Copyright 2014 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.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Color;
@@ skipping 2579 matching lines @@
     public AppBannerManager getAppBannerManagerForTesting() {
         return mAppBannerManager;
     }
 
     @VisibleForTesting
     public boolean hasPrerenderedUrl(String url) {
         return nativeHasPrerenderedUrl(mNativeTabAndroid, url);
     }
 
     /**
+     * Check if the tab is covered by its child activity.
+     * @return Whether the tab is covered by its child activity.
+     */
+    public boolean isCoveredByChildActivity() {
+        // Default return value, this is only used by subclasses.
+        return false;
+    }
+
+    /**
+     * Update whether the tab is covered by its child activity.
+     * @param isCoveredByChildActivity Whether the tab is covered by its child activity.
+     */
+    public void setCoveredByChildActivity(boolean isCoveredByChildActivity) {
+        // Empty implementation, only used by subclasses.
+    }
+
+    /**
      * Ensures the counter is at least as high as the specified value.  The counter should always
      * point to an unused ID (which will be handed out next time a request comes in).  Exposed so
      * that anything externally loading tabs and ids can set enforce new tabs start at the correct
      * id.
      * TODO(aurimas): Investigate reducing the visiblity of this method.
      * @param id The minimum id we should hand out to the next new tab.
      */
     public static void incrementIdCounterTo(int id) {
         int diff = id - sIdCounter.get();
         if (diff <= 0) return;
@@ skipping 26 matching lines @@
     private native void nativeAttachToTabContentManager(long nativeTabAndroid,
             TabContentManager tabContentManager);
     private native void nativeAttachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content, boolean visible);
     private native void nativeDetachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content);
     private native boolean nativeHasPrerenderedUrl(long nativeTabAndroid, String url);
 
     private static native void nativeRecordStartupToCommitUma();
 }