[Chrome Home] Change button style in accessibility tab switcher

Enabled with Chrome Home flag:
+ Add space to match 72dp left padding for 'remove close tab' text
+ Change 'remove closed tab' text to 14sp Med google 500

Bug: 753473
Change-Id: Ie4352cd271a70126876aeb156e9d5840cb209d13
Reviewed-on: https://chromium-review.googlesource.com/685264Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504494}

chrome/android/java/res/layout/accessibility_tab_switcher_list_item.xml

@@ -77,6 +77,12 @@
         android:layout_height="match_parent"
         android:visibility="invisible">
 
+        <Space
+            android:id="@+id/undo_start_space"
+            android:layout_width="24dp"
+            android:layout_height="match_parent"
+            android:visibility="gone" />
+
         <Button
             android:id="@+id/undo_button"
             android:layout_height="match_parent"

chrome/android/java/src/org/chromium/chrome/browser/widget/accessibility/AccessibilityTabModelListItem.java

@@ -246,6 +246,10 @@ public class AccessibilityTabModelListItem extends FrameLayout implements OnClic
 
         mUndoContents = (LinearLayout) findViewById(R.id.undo_contents);
         mUndoButton = (Button) findViewById(R.id.undo_button);
+        if (FeatureUtilities.isChromeHomeEnabled()) {
+            findViewById(R.id.undo_start_space).setVisibility(View.VISIBLE);
+            ApiCompatibilityUtils.setTextAppearance(mUndoButton, R.style.BlueButtonText2);
+        }
 
         setClickable(true);
         setFocusable(true);