[Home] Close the bottom sheet when the tab model is switched

chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java

 // Copyright 2017 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.widget.bottomsheet;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
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             mTabModelSelector.addObserver(new EmptyTabModelSelectorObserver() {
                 @Override
                 public void onTabStateInitialized() {
                     if (mHasRootLayoutOccurred) showHelpBubbleIfNecessary();
                     mTabModelSelector.removeObserver(this);
                 }
             });
         }
 
         mNtpController.setTabModelSelector(tabModelSelector);
+
+        mTabModelSelector.addObserver(new EmptyTabModelSelectorObserver() {
+            @Override
+            public void onTabModelSelected(TabModel newModel, TabModel oldModel) {
+                setSheetState(SHEET_STATE_PEEK, true);
+            }
+        });
     }
 
     /**
      * @param layoutManager The {@link LayoutManagerChrome} used to show and hide overview mode.
      */
     public void setLayoutManagerChrome(LayoutManagerChrome layoutManager) {
         mNtpController.setLayoutManagerChrome(layoutManager);
     }
 
     /**
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     }
 
     /** Ends all animations. */
     @VisibleForTesting
     public void endAnimationsForTests() {
         if (mSettleAnimator != null) mSettleAnimator.end();
         mSettleAnimator = null;
         endTransitionAnimations();
     }
 }