📰 Adjust the card display depending on the screen width.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/MarginResizer.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/MarginResizer.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/MarginResizer.java
new file mode 100644
index 0000000000000000000000000000000000000000..71591da535c085c5e3b9d40c186959fc37657c46
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/MarginResizer.java
@@ -0,0 +1,41 @@
+// 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.view.View;
+import android.view.ViewGroup.MarginLayoutParams;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.ntp.DisplayStyleObserver;
+import org.chromium.chrome.browser.ntp.UiConfig;
+
+/**
+ * Adds lateral margins to the view when the display style is {@link UiConfig#DISPLAY_STYLE_WIDE}.
+ */
+public class MarginResizer implements DisplayStyleObserver {
+    private final int mWideMarginSizePixels;
+    private final View mView;
+
+    public static DisplayStyleObserverAdapter createWithViewAdapter(View view, UiConfig config) {
+        return new DisplayStyleObserverAdapter(view, config, new MarginResizer(view));
+    }
+
+    public MarginResizer(View view) {
+        mView = view;
+        mWideMarginSizePixels =
+                view.getResources().getDimensionPixelSize(R.dimen.ntp_wide_card_lateral_margins);
+    }
+
+    @Override
+    public void onDisplayStyleChanged(@UiConfig.DisplayStyle int newDisplayStyle) {
+        MarginLayoutParams layoutParams = (MarginLayoutParams) mView.getLayoutParams();
+        if (newDisplayStyle == UiConfig.DISPLAY_STYLE_WIDE) {
+            layoutParams.setMargins(mWideMarginSizePixels, layoutParams.topMargin,
+                    mWideMarginSizePixels, layoutParams.bottomMargin);
+        } else {
+            layoutParams.setMargins(0, layoutParams.topMargin, 0, layoutParams.bottomMargin);
+        }
+    }
+}