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

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java
new file mode 100644
index 0000000000000000000000000000000000000000..eb1397adf02538a31461c2376a01b0840a9c898d
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java
@@ -0,0 +1,97 @@
+// 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.cards;
+
+import android.content.Context;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.util.AttributeSet;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputConnection;
+
+/**
+ * Simple wrapper on top of a RecyclerView that will acquire focus when tapped.  Ensures the
+ * New Tab page receives focus when clicked.
+ */
+public class NewTabPageRecyclerView extends RecyclerView {
+    /**
+     * Listener for scroll changes.
+     */
+    public interface OnScrollListener {
+        /**
+         * Triggered when the scroll changes.  See ScrollView#onScrollChanged for more
+         * details.
+         */
+        void onScrollChanged(int l, int t, int oldl, int oldt);
+    }
+
+    private GestureDetector mGestureDetector;
+    private OnScrollListener mOnScrollListener;
+
+    /**
+     * Constructor needed to inflate from XML.
+     */
+    public NewTabPageRecyclerView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        mGestureDetector =
+                new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {
+                    @Override
+                    public boolean onSingleTapUp(MotionEvent e) {
+                        boolean retVal = super.onSingleTapUp(e);
+                        requestFocus();
+                        return retVal;
+                    }
+                });
+        setLayoutManager(new LinearLayoutManager(getContext()));
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent ev) {
+        mGestureDetector.onTouchEvent(ev);
+        return super.onInterceptTouchEvent(ev);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent ev) {
+        // Action down would already have been handled in onInterceptTouchEvent
+        if (ev.getActionMasked() != MotionEvent.ACTION_DOWN) {
+            mGestureDetector.onTouchEvent(ev);
+        }
+        return super.onTouchEvent(ev);
+    }
+
+    /**
+     * Sets the listener to be notified of scroll changes.
+     * @param listener The listener to be updated on scroll changes.
+     */
+    public void setOnScrollListener(OnScrollListener listener) {
+        mOnScrollListener = listener;
+    }
+
+    @Override
+    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
+        super.onScrollChanged(l, t, oldl, oldt);
+        if (mOnScrollListener != null) mOnScrollListener.onScrollChanged(l, t, oldl, oldt);
+    }
+
+    @Override
+    public void focusableViewAvailable(View v) {
+        // To avoid odd jumps during NTP animation transitions, we do not attempt to give focus
+        // to child views if this scroll view already has focus.
+        if (hasFocus()) return;
+        super.focusableViewAvailable(v);
+    }
+
+    @Override
+    public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
+        // Fixes lanscape transitions when unfocusing the URL bar: crbug.com/288546
+        outAttrs.imeOptions = EditorInfo.IME_FLAG_NO_FULLSCREEN;
+        return super.onCreateInputConnection(outAttrs);
+    }
+}