Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/RecentTabsRowAdapter.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/RecentTabsRowAdapter.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/RecentTabsRowAdapter.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/RecentTabsRowAdapter.java
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@@ -0,0 +1,835 @@
+// Copyright 2015 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.ntp;
+
+import android.app.Activity;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.text.TextUtils;
+import android.util.LruCache;
+import android.view.ContextMenu;
+import android.view.LayoutInflater;
+import android.view.MenuItem;
+import android.view.MenuItem.OnMenuItemClickListener;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseExpandableListAdapter;
+import android.widget.TextView;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.ApiCompatibilityUtils;
+import org.chromium.chrome.browser.ForeignSessionHelper.ForeignSession;
+import org.chromium.chrome.browser.ForeignSessionHelper.ForeignSessionTab;
+import org.chromium.chrome.browser.ForeignSessionHelper.ForeignSessionWindow;
+import org.chromium.chrome.browser.RecentlyClosedBridge.RecentlyClosedTab;
+import org.chromium.chrome.browser.favicon.FaviconHelper.FaviconImageCallback;
+import org.chromium.ui.WindowOpenDisposition;
+import org.chromium.ui.base.DeviceFormFactor;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Row adapter for presenting recently closed tabs, synced tabs from other devices, the sync or
+ * sign in promo, and currently open tabs (only in document mode) in a grouped list view.
+ */
+public class RecentTabsRowAdapter extends BaseExpandableListAdapter {
+    private static final int MAX_NUM_FAVICONS_TO_CACHE = 256;
+
+    private enum ChildType {
+        NONE, DEFAULT_CONTENT, SYNC_PROMO
+    }
+
+    private enum GroupType {
+        CONTENT, VISIBLE_SEPARATOR, INVISIBLE_SEPARATOR
+    }
+
+    private final Activity mActivity;
+    private final ArrayList<Group> mGroups;
+    private final Drawable mDefaultFavicon;
+    private final RecentTabsManager mRecentTabsManager;
+    private final RecentlyClosedTabsGroup mRecentlyClosedTabsGroup = new RecentlyClosedTabsGroup();
+    private final SeparatorGroup mVisibleSeparatorGroup = new SeparatorGroup(true);
+    private final SeparatorGroup mInvisibleSeparatorGroup = new SeparatorGroup(false);
+    private final long mInitializationTimestamp;  // Seconds since Unix epoch.
+    private final FaviconCache mFaviconCache;
+    private final int mFaviconSize;
+
+    /**
+     * A generic group of objects to be shown in the RecentTabsRowAdapter, such as the list of
+     * recently closed tabs.
+     */
+    abstract class Group {
+        /**
+         * @return The type of group: GroupType.CONTENT or GroupType.SEPARATOR.
+         */
+        abstract GroupType getGroupType();
+
+        /**
+         * @return The number of children in this group.
+         */
+        abstract int getChildrenCount();
+
+        /**
+         * @return The child type.
+         */
+        abstract ChildType getChildType();
+
+
+        /**
+         * @return The child at the position childPosition.
+         */
+        abstract Object getChild(int childPosition);
+
+        /**
+         * Returns the view corresponding to the child view at a given position.
+         *
+         * @param childPosition The position of the child.
+         * @param isLastChild Whether this child is the last one.
+         * @param convertView The re-usable child view (may be null).
+         * @param parent The parent view group.
+         *
+         * @return The view corresponding to the child.
+         */
+        View getChildView(int childPosition, boolean isLastChild,
+                View convertView, ViewGroup parent) {
+            View childView = convertView;
+            if (childView == null) {
+                LayoutInflater inflater = LayoutInflater.from(mActivity);
+                childView = inflater.inflate(R.layout.recent_tabs_list_item, parent, false);
+
+                ViewHolder viewHolder = new ViewHolder();
+                viewHolder.textView = (TextView) childView;
+                childView.setTag(viewHolder);
+            }
+
+            ViewHolder viewHolder = (ViewHolder) childView.getTag();
+            configureChildView(childPosition, viewHolder);
+
+            return childView;
+        }
+
+        /**
+         * Configures a view inflated from recent_tabs_list_item.xml to display information about
+         * a child in this group.
+         *
+         * @param childPosition The position of the child within this group.
+         * @param viewHolder The ViewHolder with references to pieces of the view.
+         */
+        abstract void configureChildView(int childPosition, ViewHolder viewHolder);
+
+        /**
+         * Returns the view corresponding to this group.
+         *
+         * @param isExpanded Whether the group is expanded.
+         * @param convertView The re-usable group view (may be null).
+         * @param parent The parent view group.
+         *
+         * @return The view corresponding to the group.
+         */
+        public View getGroupView(boolean isExpanded, View convertView, ViewGroup parent) {
+            assert convertView == null || convertView instanceof RecentTabsGroupView;
+            RecentTabsGroupView groupView = (RecentTabsGroupView) convertView;
+            if (groupView == null) {
+                groupView = (RecentTabsGroupView) LayoutInflater.from(mActivity).inflate(
+                        R.layout.recent_tabs_group_item, parent, false);
+                groupView.initialize(mInitializationTimestamp);
+            }
+            configureGroupView(groupView, isExpanded);
+            return groupView;
+        }
+
+        /**
+         * Configures an RecentTabsGroupView to display the header of this group.
+         * @param groupView The RecentTabsGroupView to configure.
+         * @param isExpanded Whether the view is currently expanded.
+         */
+        abstract void configureGroupView(RecentTabsGroupView groupView, boolean isExpanded);
+
+        /**
+         * Sets whether this group is collapsed (i.e. whether only the header is visible).
+         */
+        abstract void setCollapsed(boolean isCollapsed);
+
+        /**
+         * @return Whether this group is collapsed.
+         */
+        abstract boolean isCollapsed();
+
+        /**
+         * Called when a child item is clicked.
+         * @param childPosition The position of the child in the group.
+         * @return Whether the click was handled.
+         */
+        abstract boolean onChildClick(int childPosition);
+
+        /**
+         * Called when the context menu for the group view is being built.
+         * @param menu The context menu being built.
+         * @param activity The current activity.
+         */
+        void onCreateContextMenuForGroup(ContextMenu menu, Activity activity) {
+        }
+
+        /**
+         * Called when a context menu for one of the child views is being built.
+         * @param childPosition The position of the child in the group.
+         * @param menu The context menu being built.
+         * @param activity The current activity.
+         */
+        void onCreateContextMenuForChild(int childPosition, ContextMenu menu,
+                Activity activity) {
+        }
+    }
+
+    /**
+     * A group containing all the tabs currently open on this device.
+     */
+    class CurrentlyOpenTabsGroup extends Group {
+        private static final int NUM_DEFAULT_VISIBLE_TABS = 6;
+
+        private final List<CurrentlyOpenTab> mCurrentlyOpenTabs;
+        private final boolean mShowingAll;
+
+        public CurrentlyOpenTabsGroup(List<CurrentlyOpenTab> tabsList) {
+            mCurrentlyOpenTabs = tabsList;
+            mShowingAll = mRecentTabsManager.isCurrentlyOpenTabsShowingAll();
+        }
+
+        private boolean isMoreButton(int childPosition) {
+            return !mShowingAll && childPosition
+                    == Math.min(NUM_DEFAULT_VISIBLE_TABS, mCurrentlyOpenTabs.size());
+        }
+
+        @Override
+        GroupType getGroupType() {
+            return GroupType.CONTENT;
+        }
+
+        @Override
+        int getChildrenCount() {
+            if (mShowingAll) return mCurrentlyOpenTabs.size();
+            return Math.min(NUM_DEFAULT_VISIBLE_TABS, mCurrentlyOpenTabs.size() - 1) + 1;
+        }
+
+        @Override
+        ChildType getChildType() {
+            return ChildType.DEFAULT_CONTENT;
+        }
+
+        @Override
+        CurrentlyOpenTab getChild(int childPosition) {
+            if (isMoreButton(childPosition)) return null;
+
+            return mCurrentlyOpenTabs.get(childPosition);
+        }
+
+        @Override
+        void configureChildView(int childPosition, ViewHolder viewHolder) {
+            if (isMoreButton(childPosition)) {
+                Resources resources = mActivity.getResources();
+                String text = resources.getString(R.string.recent_tabs_show_more);
+                viewHolder.textView.setText(text);
+                Drawable drawable =  ApiCompatibilityUtils.getDrawable(
+                        resources, R.drawable.more_horiz);
+                ApiCompatibilityUtils.setCompoundDrawablesRelativeWithIntrinsicBounds(
+                        viewHolder.textView, drawable, null, null, null);
+            } else {
+                CurrentlyOpenTab openTab = getChild(childPosition);
+                viewHolder.textView.setText(TextUtils.isEmpty(openTab.getTitle()) ? openTab.getUrl()
+                        : openTab.getTitle());
+                loadLocalFavicon(viewHolder, openTab.getUrl());
+            }
+        }
+
+        @Override
+        void configureGroupView(RecentTabsGroupView groupView, boolean isExpanded) {
+            groupView.configureForCurrentlyOpenTabs(isExpanded);
+        }
+
+        @Override
+        void setCollapsed(boolean isCollapsed) {
+            mRecentTabsManager.setCurrentlyOpenTabsCollapsed(isCollapsed);
+        }
+
+        @Override
+        boolean isCollapsed() {
+            return mRecentTabsManager.isCurrentlyOpenTabsCollapsed();
+        }
+
+        @Override
+        boolean onChildClick(int childPosition) {
+            if (isMoreButton(childPosition)) {
+                mRecentTabsManager.setCurrentlyOpenTabsShowAll(true);
+            } else {
+                getChild(childPosition).getRunnable().run();
+            }
+            return true;
+        }
+    }
+
+    /**
+     * A group containing all the tabs associated with a foreign session from a synced device.
+     */
+    class ForeignSessionGroup extends Group {
+        private final ForeignSession mForeignSession;
+
+        ForeignSessionGroup(ForeignSession foreignSession) {
+            mForeignSession = foreignSession;
+        }
+
+        @Override
+        public GroupType getGroupType() {
+            return GroupType.CONTENT;
+        }
+
+        @Override
+        public int getChildrenCount() {
+            int count = 0;
+            for (ForeignSessionWindow window : mForeignSession.windows) {
+                count += window.tabs.size();
+            }
+            return count;
+        }
+
+        @Override
+        public ChildType getChildType() {
+            return ChildType.DEFAULT_CONTENT;
+        }
+
+        @Override
+        public ForeignSessionTab getChild(int childPosition) {
+            for (ForeignSessionWindow window : mForeignSession.windows) {
+                if (childPosition < window.tabs.size()) {
+                    return window.tabs.get(childPosition);
+                }
+                childPosition -= window.tabs.size();
+            }
+            assert false;
+            return null;
+        }
+
+        @Override
+        public void configureChildView(int childPosition, ViewHolder viewHolder) {
+            ForeignSessionTab sessionTab = getChild(childPosition);
+            viewHolder.textView.setText(TextUtils.isEmpty(sessionTab.title) ? sessionTab.url
+                    : sessionTab.title);
+            loadSyncedFavicon(viewHolder, sessionTab.url);
+        }
+
+        @Override
+        public void configureGroupView(RecentTabsGroupView groupView, boolean isExpanded) {
+            groupView.configureForForeignSession(mForeignSession, isExpanded);
+        }
+
+        @Override
+        public void setCollapsed(boolean isCollapsed) {
+            mRecentTabsManager.setForeignSessionCollapsed(mForeignSession, isCollapsed);
+        }
+
+        @Override
+        public boolean isCollapsed() {
+            return mRecentTabsManager.getForeignSessionCollapsed(mForeignSession);
+        }
+
+        @Override
+        public boolean onChildClick(int childPosition) {
+            ForeignSessionTab foreignSessionTab = getChild(childPosition);
+            mRecentTabsManager.openForeignSessionTab(mForeignSession, foreignSessionTab,
+                    WindowOpenDisposition.CURRENT_TAB);
+            return true;
+        }
+
+        @Override
+        public void onCreateContextMenuForGroup(ContextMenu menu, Activity activity) {
+            OnMenuItemClickListener listener = new OnMenuItemClickListener() {
+                @Override
+                public boolean onMenuItemClick(MenuItem item) {
+                    mRecentTabsManager.deleteForeignSession(mForeignSession);
+                    return true;
+                }
+            };
+            menu.add(R.string.ntp_recent_tabs_remove_menu_option)
+                    .setOnMenuItemClickListener(listener);
+        }
+
+        @Override
+        public void onCreateContextMenuForChild(int childPosition, ContextMenu menu,
+                Activity activity) {
+            final ForeignSessionTab foreignSessionTab = getChild(childPosition);
+            OnMenuItemClickListener listener = new OnMenuItemClickListener() {
+                @Override
+                public boolean onMenuItemClick(MenuItem item) {
+                    mRecentTabsManager.openForeignSessionTab(mForeignSession, foreignSessionTab,
+                            WindowOpenDisposition.NEW_BACKGROUND_TAB);
+                    return true;
+                }
+            };
+            menu.add(R.string.contextmenu_open_in_new_tab).setOnMenuItemClickListener(listener);
+        }
+    }
+
+    /**
+     * A group containing tabs that were recently closed on this device and a link to the history
+     * page.
+     */
+    class RecentlyClosedTabsGroup extends Group {
+        private static final int ID_OPEN_IN_NEW_TAB = 1;
+        private static final int ID_REMOVE_ALL = 2;
+
+        @Override
+        public GroupType getGroupType() {
+            return GroupType.CONTENT;
+        }
+
+        @Override
+        public int getChildrenCount() {
+            // The number of children is the number of recently closed tabs, plus one for the "Show
+            // full history" item.
+            return 1 + mRecentTabsManager.getRecentlyClosedTabs().size();
+        }
+
+        @Override
+        public ChildType getChildType() {
+            return ChildType.DEFAULT_CONTENT;
+        }
+
+        /**
+         * @param childPosition The index of an item in the recently closed list.
+         * @return Whether the item at childPosition is the link to the history page.
+         */
+        private boolean isHistoryLink(int childPosition) {
+            return childPosition == mRecentTabsManager.getRecentlyClosedTabs().size();
+        }
+
+        @Override
+        public RecentlyClosedTab getChild(int childPosition) {
+            if (isHistoryLink(childPosition)) {
+                return null;
+            }
+            return mRecentTabsManager.getRecentlyClosedTabs().get(childPosition);
+        }
+
+        @Override
+        public void configureChildView(int childPosition, ViewHolder viewHolder) {
+            if (isHistoryLink(childPosition)) {
+                viewHolder.textView.setText(R.string.show_full_history);
+                ApiCompatibilityUtils.setCompoundDrawablesRelativeWithIntrinsicBounds(
+                        viewHolder.textView, R.drawable.history_favicon, 0, 0, 0);
+            } else {
+                RecentlyClosedTab tab = getChild(childPosition);
+                String title = NewTabPageView.getTitleForDisplay(tab.title, tab.url);
+                viewHolder.textView.setText(title);
+                loadLocalFavicon(viewHolder, tab.url);
+            }
+        }
+
+        @Override
+        public void configureGroupView(RecentTabsGroupView groupView, boolean isExpanded) {
+            groupView.configureForRecentlyClosedTabs(isExpanded);
+        }
+
+        @Override
+        public void setCollapsed(boolean isCollapsed) {
+            mRecentTabsManager.setRecentlyClosedTabsCollapsed(isCollapsed);
+        }
+
+        @Override
+        public boolean isCollapsed() {
+            return mRecentTabsManager.isRecentlyClosedTabsCollapsed();
+        }
+
+        @Override
+        public boolean onChildClick(int childPosition) {
+            if (isHistoryLink(childPosition)) {
+                mRecentTabsManager.openHistoryPage();
+            } else {
+                mRecentTabsManager.openRecentlyClosedTab(getChild(childPosition),
+                        WindowOpenDisposition.CURRENT_TAB);
+            }
+            return true;
+        }
+
+        @Override
+        public void onCreateContextMenuForGroup(ContextMenu menu, Activity activity) {
+        }
+
+        @Override
+        public void onCreateContextMenuForChild(final int childPosition, ContextMenu menu,
+                Activity activity) {
+            final RecentlyClosedTab recentlyClosedTab = getChild(childPosition);
+            if (recentlyClosedTab == null) return;
+            OnMenuItemClickListener listener = new OnMenuItemClickListener() {
+                @Override
+                public boolean onMenuItemClick(MenuItem item) {
+                    switch (item.getItemId()) {
+                        case ID_REMOVE_ALL:
+                            mRecentTabsManager.clearRecentlyClosedTabs();
+                            break;
+                        case ID_OPEN_IN_NEW_TAB:
+                            mRecentTabsManager.openRecentlyClosedTab(recentlyClosedTab,
+                                    WindowOpenDisposition.NEW_BACKGROUND_TAB);
+                            break;
+                        default:
+                            assert false;
+                    }
+                    return true;
+                }
+            };
+            menu.add(ContextMenu.NONE, ID_OPEN_IN_NEW_TAB, ContextMenu.NONE,
+                    R.string.contextmenu_open_in_new_tab).setOnMenuItemClickListener(listener);
+            menu.add(ContextMenu.NONE, ID_REMOVE_ALL, ContextMenu.NONE,
+                    R.string.remove_all).setOnMenuItemClickListener(listener);
+        }
+    }
+
+    /**
+     * A group containing a blank separator.
+     */
+    class SeparatorGroup extends Group {
+        private final boolean mIsVisible;
+
+        public SeparatorGroup(boolean isVisible) {
+            mIsVisible = isVisible;
+        }
+
+        @Override
+        public GroupType getGroupType() {
+            return mIsVisible ? GroupType.VISIBLE_SEPARATOR : GroupType.INVISIBLE_SEPARATOR;
+        }
+
+        @Override
+        public ChildType getChildType() {
+            return ChildType.NONE;
+        }
+
+        @Override
+        public int getChildrenCount() {
+            return 0;
+        }
+
+        @Override
+        public View getGroupView(boolean isExpanded, View convertView, ViewGroup parent) {
+            if (convertView == null) {
+                int layout = mIsVisible
+                        ? R.layout.recent_tabs_group_separator_visible
+                        : R.layout.recent_tabs_group_separator_invisible;
+                convertView = LayoutInflater.from(mActivity).inflate(layout, parent, false);
+            }
+            return convertView;
+        }
+
+        @Override
+        public void configureGroupView(RecentTabsGroupView groupView, boolean isExpanded) {
+        }
+
+        @Override
+        public void configureChildView(int childPosition, ViewHolder viewHolder) {
+        }
+
+        @Override
+        public Object getChild(int childPosition) {
+            return null;
+        }
+
+        @Override
+        public void setCollapsed(boolean isCollapsed) {
+        }
+
+        @Override
+        public boolean isCollapsed() {
+            return false;
+        }
+
+        @Override
+        public boolean onChildClick(int childPosition) {
+            return false;
+        }
+    }
+
+    /**
+     * A group containing the Sync Promo.
+     */
+    class SyncPromoGroup extends Group {
+        @Override
+        public GroupType getGroupType() {
+            return GroupType.CONTENT;
+        }
+
+        @Override
+        public ChildType getChildType() {
+            return ChildType.SYNC_PROMO;
+        }
+
+        @Override
+        public int getChildrenCount() {
+            return 1;
+        }
+
+        @Override
+        public Object getChild(int childPosition) {
+            return null;
+        }
+
+        @Override
+        View getChildView(int childPosition, boolean isLastChild, View convertView,
+                ViewGroup parent) {
+            if (convertView == null) {
+                convertView = new RecentTabsPromoView(mActivity, mRecentTabsManager, null);
+            }
+            return convertView;
+        }
+
+        @Override
+        public void configureChildView(int childPosition, ViewHolder viewHolder) {
+        }
+
+        @Override
+        public void configureGroupView(RecentTabsGroupView groupView, boolean isExpanded) {
+            groupView.configureForSyncPromo(isExpanded);
+        }
+
+        @Override
+        public void setCollapsed(boolean isCollapsed) {
+            mRecentTabsManager.setSyncPromoCollapsed(isCollapsed);
+        }
+
+        @Override
+        public boolean isCollapsed() {
+            return mRecentTabsManager.isSyncPromoCollapsed();
+        }
+
+        @Override
+        public boolean onChildClick(int childPosition) {
+            return false;
+        }
+    }
+
+    private static class FaviconCache {
+        private static final String SYNCED_FAVICON_PREFIX = "Synced";
+        private static final String LOCAL_FAVICON_PREFIX = "Local";
+
+        private final LruCache<String, Drawable> mMemoryCache;
+
+        public FaviconCache(int size) {
+            mMemoryCache = new LruCache<String, Drawable>(size);
+        }
+
+        public Drawable getSyncedFaviconImage(String url) {
+            return mMemoryCache.get(SYNCED_FAVICON_PREFIX + url);
+        }
+
+        public void putSycnedFaviconImage(String url, Drawable image) {
+            mMemoryCache.put(SYNCED_FAVICON_PREFIX + url, image);
+        }
+
+        public Drawable getLocalFaviconImage(String url) {
+            return mMemoryCache.get(LOCAL_FAVICON_PREFIX + url);
+        }
+
+        public void putLocalFaviconImage(String url, Drawable image) {
+            mMemoryCache.put(LOCAL_FAVICON_PREFIX + url, image);
+        }
+    }
+
+    /**
+     * Creates an RecentTabsRowAdapter used to populate an ExpandableList with other
+     * devices and foreign tab cells.
+     *
+     * @param activity The Android activity this adapter will work in.
+     * @param recentTabsManager The RecentTabsManager that will act as the data source.
+     */
+    public RecentTabsRowAdapter(Activity activity, RecentTabsManager recentTabsManager) {
+        mActivity = activity;
+        mRecentTabsManager = recentTabsManager;
+        mGroups = new ArrayList<Group>();
+        mInitializationTimestamp =
+            TimeUnit.SECONDS.convert(System.currentTimeMillis(), TimeUnit.MILLISECONDS);
+        mFaviconCache = buildFaviconCache(MAX_NUM_FAVICONS_TO_CACHE);
+
+        Resources resources = activity.getResources();
+        mDefaultFavicon = ApiCompatibilityUtils.getDrawable(resources, R.drawable.default_favicon);
+        mFaviconSize = mDefaultFavicon.getIntrinsicHeight();
+    }
+
+    private static FaviconCache buildFaviconCache(int size) {
+        return new FaviconCache(size);
+    }
+
+    /**
+     * ViewHolder class optimizes looking up table row fields. findViewById is only called once
+     * per row view initialization, and the references are cached here. Also stores a reference to
+     * the favicon image callback; so that we can make sure we load the correct favicon.
+     */
+    private static class ViewHolder {
+        public TextView textView;
+        public FaviconImageCallback imageCallback;
+    }
+
+    private Drawable faviconDrawable(Bitmap image) {
+        if (image == null) return null;
+        return new BitmapDrawable(mActivity.getResources(), Bitmap.createScaledBitmap(image,
+                mFaviconSize, mFaviconSize, true));
+    }
+
+    private void loadSyncedFavicon(final ViewHolder viewHolder, final String url) {
+        Drawable image = mFaviconCache.getSyncedFaviconImage(url);
+        if (image == null) {
+            image = faviconDrawable(mRecentTabsManager.getSyncedFaviconImageForURL(url));
+            image = (image == null) ? mDefaultFavicon : image;
+            mFaviconCache.putSycnedFaviconImage(url, image);
+        }
+        ApiCompatibilityUtils.setCompoundDrawablesRelativeWithIntrinsicBounds(viewHolder.textView,
+                image, null, null, null);
+    }
+
+    private void loadLocalFavicon(final ViewHolder viewHolder, final String url) {
+        Drawable image;
+        if (url == null) {
+            // URL is null for print jobs, for example.
+            image = mDefaultFavicon;
+        } else {
+            image = mFaviconCache.getLocalFaviconImage(url);
+            if (image == null) {
+                FaviconImageCallback imageCallback = new FaviconImageCallback() {
+                    @Override
+                    public void onFaviconAvailable(Bitmap bitmap, String iconUrl) {
+                        if (this != viewHolder.imageCallback) return;
+                        Drawable image = faviconDrawable(bitmap);
+                        image = (image == null) ? mDefaultFavicon : image;
+                        mFaviconCache.putLocalFaviconImage(url, image);
+                        ApiCompatibilityUtils.setCompoundDrawablesRelativeWithIntrinsicBounds(
+                                viewHolder.textView, image, null, null, null);
+                    }
+                };
+                viewHolder.imageCallback = imageCallback;
+                mRecentTabsManager.getLocalFaviconForUrl(url, mFaviconSize, imageCallback);
+                image = mDefaultFavicon;
+            }
+        }
+        ApiCompatibilityUtils.setCompoundDrawablesRelativeWithIntrinsicBounds(viewHolder.textView,
+                image, null, null, null);
+    }
+
+    @Override
+    public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
+            View convertView, ViewGroup parent) {
+        return getGroup(groupPosition).getChildView(childPosition, isLastChild, convertView,
+                parent);
+    }
+
+    // BaseExpandableListAdapter group related implementations
+    @Override
+    public int getGroupCount() {
+        return mGroups.size();
+    }
+
+    @Override
+    public long getGroupId(int groupPosition) {
+        return groupPosition;
+    }
+
+    @Override
+    public Group getGroup(int groupPosition) {
+        return mGroups.get(groupPosition);
+    }
+
+    @Override
+    public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
+            ViewGroup parent) {
+        return getGroup(groupPosition).getGroupView(isExpanded, convertView, parent);
+    }
+
+    // BaseExpandableListAdapter child related implementations
+    @Override
+    public int getChildrenCount(int groupPosition) {
+        return getGroup(groupPosition).getChildrenCount();
+    }
+
+    @Override
+    public long getChildId(int groupPosition, int childPosition) {
+        return childPosition;
+    }
+
+    @Override
+    public Object getChild(int groupPosition, int childPosition) {
+        return getGroup(groupPosition).getChild(childPosition);
+    }
+
+    @Override
+    public boolean isChildSelectable(int groupPosition, int childPosition) {
+        return true;
+    }
+
+    // BaseExpandableListAdapter misc. implementation
+    @Override
+    public boolean hasStableIds() {
+        return false;
+    }
+
+    @Override
+    public int getGroupType(int groupPosition) {
+        return getGroup(groupPosition).getGroupType().ordinal();
+    }
+
+    @Override
+    public int getGroupTypeCount() {
+        return GroupType.values().length;
+    }
+
+    private void addGroup(Group group) {
+        if (!DeviceFormFactor.isTablet(mActivity)) {
+            mGroups.add(group);
+        } else {
+            if (mGroups.size() == 0) {
+                mGroups.add(mInvisibleSeparatorGroup);
+            }
+            mGroups.add(group);
+            mGroups.add(mInvisibleSeparatorGroup);
+        }
+    }
+
+    @Override
+    public void notifyDataSetChanged() {
+        mGroups.clear();
+        List<CurrentlyOpenTab> tabList = mRecentTabsManager.getCurrentlyOpenTabs();
+        if (tabList != null && !tabList.isEmpty()) {
+            addGroup(new CurrentlyOpenTabsGroup(tabList));
+        }
+        addGroup(mRecentlyClosedTabsGroup);
+        for (ForeignSession session : mRecentTabsManager.getForeignSessions()) {
+            addGroup(new ForeignSessionGroup(session));
+        }
+        if (mRecentTabsManager.shouldDisplaySyncPromo()) {
+            addGroup(new SyncPromoGroup());
+        }
+
+        // Add separator line after the recently closed tabs group.
+        int recentlyClosedIndex = mGroups.indexOf(mRecentlyClosedTabsGroup);
+        if (DeviceFormFactor.isTablet(mActivity)) {
+            if (recentlyClosedIndex != mGroups.size() - 2) {
+                mGroups.set(recentlyClosedIndex + 1, mVisibleSeparatorGroup);
+            }
+        } else if (recentlyClosedIndex != mGroups.size() - 1) {
+            mGroups.add(recentlyClosedIndex + 1, mVisibleSeparatorGroup);
+        }
+
+        super.notifyDataSetChanged();
+    }
+
+    @Override
+    public int getChildType(int groupPosition, int childPosition) {
+        return mGroups.get(groupPosition).getChildType().ordinal();
+    }
+
+    @Override
+    public int getChildTypeCount() {
+        return ChildType.values().length;
+    }
+}