Increase hot rectangle of trash can.

The drop region is now 70dip^2. This means it invisibly
overlaps nearby icons ever so slightly---not enough to
prevent icons being properly dropped on the workspace.

Bug: 2623734
Change-Id: I945160ef6bdfc0a4ac3cf9db57d440bad424dfc4

res/layout-land/launcher.xml

@@ -77,8 +77,9 @@
 
     <com.android.launcher2.DeleteZone
         android:id="@+id/delete_zone"
-        android:layout_width="@dimen/button_bar_height_portrait"
-        android:layout_height="match_parent"
+        android:layout_width="@dimen/delete_zone_size"
+        android:layout_height="@dimen/delete_zone_size"
+        android:paddingLeft="@dimen/delete_zone_padding"
         android:layout_marginBottom="@dimen/half_status_bar_height"
         android:layout_gravity="right|center_vertical"
 

res/layout-port/launcher.xml

@@ -71,8 +71,9 @@
 
     <com.android.launcher2.DeleteZone
         android:id="@+id/delete_zone"
-        android:layout_width="wrap_content"
-        android:layout_height="@dimen/button_bar_height"
+        android:layout_width="@dimen/delete_zone_size"
+        android:layout_height="@dimen/delete_zone_size"
+        android:paddingTop="@dimen/delete_zone_padding"
         android:layout_gravity="bottom|center_horizontal"
 
         android:scaleType="center"

res/values/dimens.xml

@@ -27,4 +27,10 @@
     <!-- roughly half a status bar (for vertically centering the right-hand
          button cluster in landscape) -->
     <dimen name="half_status_bar_height">12dip</dimen>
+
+    <!-- height & width of the drop rectangle for the trash icon -->
+    <dimen name="delete_zone_size">70dip</dimen>
+    
+    <!-- delete_zone_size_full - button_bar_height_portrait -->
+    <dimen name="delete_zone_padding">14dip</dimen>
 </resources>