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

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java
new file mode 100644
index 0000000000000000000000000000000000000000..89f8093f30e57bdeb7a08fca9dc141c1283dedf7
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java
@@ -0,0 +1,118 @@
+// Copyright 2016 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.view.View;
+import android.widget.ImageView;
+
+import org.chromium.base.Log;
+import org.chromium.base.StreamUtil;
+import org.chromium.chrome.browser.ntp.cards.NewTabPageListItem;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+/**
+ * Represents the data for an article card on the NTP.
+ */
+public class SnippetArticle implements NewTabPageListItem {
+    private static final String TAG = "SnippetArticle";
+
+    private static final int FADE_IN_ANIMATION_TIME_MS = 300;
+
+    public final String mTitle;
+    public final String mPublisher;
+    public final String mPreviewText;
+    public final String mUrl;
+    public final String mThumbnailUrl;
+    public final long mTimestamp;
+    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) {
+            if (thumbnail == null) {
+                mThumbnailView.setVisibility(View.GONE);
+            } else {
+                // Fade in the image thumbnail
+                mThumbnailView.setImageDrawable(thumbnail);
+                mThumbnailView.setVisibility(View.VISIBLE);
+                mThumbnailView.setAlpha(0f);
+                mThumbnailView.animate().alpha(1f).setDuration(FADE_IN_ANIMATION_TIME_MS);
+            }
+        }
+    }
+
+    /**
+     * Creates a SnippetArticle object that will hold the data
+     * @param title the title of the article
+     * @param publisher the canonical publisher name (e.g., New York Times)
+     * @param previewText the snippet preview text
+     * @param url the URL of the article
+     * @param thumbnailUrl the URL of the thumbnail
+     * @param timestamp the time in ms when this article was published
+     * @param position the position of this article in the list of snippets
+     */
+    public SnippetArticle(String title, String publisher, String previewText, String url,
+            String thumbnailUrl, long timestamp, int position) {
+        mTitle = title;
+        mPublisher = publisher;
+        mPreviewText = previewText;
+        mUrl = url;
+        mThumbnailUrl = thumbnailUrl;
+        mTimestamp = timestamp;
+        mPosition = position;
+    }
+
+    @Override
+    public int getType() {
+        return NewTabPageListItem.VIEW_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, mThumbnailUrl);
+    }
+}