[Home] Fix solid-color tab switcher toolbar

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;
@@ skipping 660 matching lines @@
         List<Animator> animators = new ArrayList<>();
         mContentSwapAnimatorSet = new AnimatorSet();
         mContentSwapAnimatorSet.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
                 mSheetContent = content;
                 for (BottomSheetObserver o : mObservers) {
                     o.onSheetContentChanged(content);
                 }
                 updateHandleTint();
+                mToolbarHolder.setBackgroundColor(Color.TRANSPARENT);
                 mContentSwapAnimatorSet = null;
             }
         });
 
         // For the toolbar transition, make sure we don't detach the default toolbar view.
         animators.add(getViewTransitionAnimator(
                 newToolbar, oldToolbar, mToolbarHolder, mDefaultToolbarView != oldToolbar));
         animators.add(getViewTransitionAnimator(
                 content.getContentView(), oldContent, mBottomSheetContentContainer, true));
 
+        // Temporarily make the background of the toolbar holder a solid color so the transition
+        // doesn't appear to show a hole in the toolbar.
+        mToolbarHolder.setBackgroundColor(
+                ApiCompatibilityUtils.getColor(getResources(), R.color.default_primary_color));
         mContentSwapAnimatorSet.playTogether(animators);
         mContentSwapAnimatorSet.start();
 
         // If the existing content is null, end the animation immediately.
         if (mSheetContent == null) mContentSwapAnimatorSet.end();
     }
 
     /**
      * Creates a transition animation between two views. The old view is faded out completely
      * before the new view is faded in. There is an option to detach the old view or not.
@@ skipping 453 matching lines @@
                 getContext(), mControlContainer, R.string.bottom_sheet_help_bubble_message);
         int inset = getContext().getResources().getDimensionPixelSize(
                 R.dimen.bottom_sheet_help_bubble_inset);
         helpBubble.setInsetPx(0, inset, 0, inset);
         helpBubble.setDismissOnTouchInteraction(true);
         helpBubble.show();
 
         preferences.edit().putBoolean(BOTTOM_SHEET_HELP_BUBBLE_SHOWN, true).apply();
     }
 }