Add new NTP layout with snippet cards and hide it behind a flag

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsManager.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsManager.java
deleted file mode 100644
index 16d74ade3a6fa20d24fc1f42f006bc3241f95486..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsManager.java
+++ /dev/null
@@ -1,188 +0,0 @@
-// 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.snippets;
-
-import android.graphics.drawable.Drawable;
-import android.os.AsyncTask;
-import android.support.v7.widget.RecyclerView;
-import android.widget.ImageView;
-
-import org.chromium.base.Log;
-import org.chromium.base.StreamUtil;
-import org.chromium.chrome.browser.ntp.NewTabPageView.NewTabPageManager;
-import org.chromium.chrome.browser.ntp.snippets.SnippetsBridge.SnippetsObserver;
-import org.chromium.chrome.browser.profiles.Profile;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.net.MalformedURLException;
-import java.net.URL;
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * A class that stores and manages the article snippets that will be shown on the NTP.
- */
-public class SnippetsManager {
-    private static final String TAG = "SnippetsManager";
-
-    /**
-     * Describes the header of a group of similar card snippets
-     */
-    public static final int SNIPPET_ITEM_TYPE_HEADER = 1;
-    /**
-     * Describes a single card snippet
-     */
-    public static final int SNIPPET_ITEM_TYPE_SNIPPET = 2;
-
-    /**
-     * Enum values for recording {@code SNIPPETS_STATE_HISTOGRAM} histogram.
-     * Stored here as it is recorded in multiple places.
-     */
-    public static final int SNIPPETS_SHOWN = 0;
-    public static final int SNIPPETS_SCROLLED = 1;
-    public static final int SNIPPETS_CLICKED = 2;
-    public static final int NUM_SNIPPETS_ACTIONS = 3;
-    public static final String SNIPPETS_STATE_HISTOGRAM = "NewTabPage.Snippets.Interactions";
-
-    private NewTabPageManager mNewTabPageManager;
-    private SnippetsAdapter mDataAdapter;
-    private SnippetsBridge mSnippetsBridge;
-
-    /** Base type for anything to add to the snippets view
-     */
-    public interface SnippetListItem {
-        /**
-         * Returns the type of this snippet item (SNIPPET_ITEM_TYPE_HEADER or
-         * SNIPPET_ITEM_TYPE_SNIPPET). This is so we can distinguish between different elements
-         * that are held in a single RecyclerView holder.
-         *
-         * @return the type of this list item.
-         */
-        public int getType();
-    }
-
-    /** Represents the data for a header of a group of snippets
-     */
-    public static class SnippetHeader implements SnippetListItem {
-        public final String mRecommendationBasis;
-
-        public SnippetHeader(String recommendationBasis) {
-            mRecommendationBasis = recommendationBasis;
-        }
-
-        @Override
-        public int getType() {
-            return SNIPPET_ITEM_TYPE_HEADER;
-        }
-    }
-
-    /**
-     * Represents the data for a card snippet.
-     */
-    public static class SnippetArticle implements SnippetListItem {
-        public final String mTitle;
-        public final String mPublisher;
-        public final String mPreviewText;
-        public final String mUrl;
-        public final String mThumbnailPath;
-        public final int mPosition;
-
-        private ThumbnailRenderingTask mThumbnailRenderingTask;
-
-        // Async task to create the thumbnail from a URL
-        // TODO(maybelle): This task to retrieve the thumbnail from the web is temporary while
-        // we are prototyping this feature for clank. For the real production feature, we
-        // will likely have to download/decode the thumbnail on the native side.
-        private static class ThumbnailRenderingTask extends AsyncTask<String, Void, Drawable> {
-            private ImageView mThumbnailView;
-
-            ThumbnailRenderingTask(ImageView thumbnailView) {
-                mThumbnailView = thumbnailView;
-            }
-
-            @Override
-            protected Drawable doInBackground(String... params) {
-                if (params[0].isEmpty()) return null;
-                InputStream is = null;
-                try {
-                    is = (InputStream) new URL(params[0]).getContent();
-                    return Drawable.createFromStream(is, "thumbnail");
-                } catch (MalformedURLException e) {
-                    Log.e(TAG, "Could not get image thumbnail due to malformed URL", e);
-                } catch (IOException e) {
-                    Log.e(TAG, "Could not get image thumbnail", e);
-                } finally {
-                    StreamUtil.closeQuietly(is);
-                }
-                return null;
-            }
-
-            @Override
-            protected void onPostExecute(Drawable thumbnail) {
-                mThumbnailView.setImageDrawable(thumbnail);
-            }
-        }
-
-        public SnippetArticle(String title, String publisher, String previewText, String url,
-                String thumbnailPath, int position) {
-            mTitle = title;
-            mPublisher = publisher;
-            mPreviewText = previewText;
-            mUrl = url;
-            mThumbnailPath = thumbnailPath;
-            mPosition = position;
-        }
-
-        @Override
-        public int getType() {
-            return SNIPPET_ITEM_TYPE_SNIPPET;
-        }
-
-        /**
-         * Retrieves this SnippetArticle's thumbnail asynchronously and sets it onto the given
-         * ImageView.
-         *
-         * @param view The ImageView to set the thumbnail onto.
-         */
-        public void setThumbnailOnView(ImageView view) {
-            if (mThumbnailRenderingTask != null) mThumbnailRenderingTask.cancel(true);
-
-            mThumbnailRenderingTask = new ThumbnailRenderingTask(view);
-            mThumbnailRenderingTask.executeOnExecutor(
-                    AsyncTask.THREAD_POOL_EXECUTOR, mThumbnailPath);
-        }
-    }
-
-    public SnippetsManager(NewTabPageManager tabManager, Profile profile) {
-        mNewTabPageManager = tabManager;
-        mDataAdapter = new SnippetsAdapter(this);
-        mSnippetsBridge = new SnippetsBridge(profile, new SnippetsObserver() {
-            @Override
-            public void onSnippetsAvailable(
-                    String[] titles, String[] urls, String[] thumbnailUrls, String[] previewText) {
-                List<SnippetListItem> listItems = new ArrayList<SnippetListItem>();
-                for (int i = 0; i < titles.length; ++i) {
-                    SnippetArticle article = new SnippetArticle(
-                            titles[i], "", previewText[i], urls[i], thumbnailUrls[i], i);
-                    listItems.add(article);
-                }
-                mDataAdapter.setSnippetListItems(listItems);
-            }
-        });
-    }
-
-    public void setSnippetsView(RecyclerView mSnippetsView) {
-        mSnippetsView.setAdapter(mDataAdapter);
-    }
-
-    public void loadUrl(String url) {
-        mNewTabPageManager.open(url);
-    }
-
-    public void destroy() {
-        mSnippetsBridge.destroy();
-    }
-}