[EmptyView] add drop figure and use it as text replacement.

Use the drop figure in the launcher icon.
Use the drop figure as text replacement for empty views.

CameraColorPicker/app/src/kids/res/layout/view_color_item_list_page.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <android.support.v7.widget.RecyclerView
+        android:id="@+id/view_color_item_list_page_list_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <ImageView
+        android:id="@+id/view_color_item_list_page_empty_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_gravity="center"
+        android:alpha="0.3"
+        android:scaleType="centerInside"
+        android:src="@drawable/drop_sad" />
+
+</merge>

CameraColorPicker/app/src/kids/res/layout/view_palette_list_page.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <android.support.v7.widget.RecyclerView
+        android:id="@+id/view_palette_list_page_list_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <ImageView
+        android:id="@+id/view_palette_list_empty_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_gravity="center"
+        android:alpha="0.3"
+        android:scaleType="centerInside"
+        android:src="@drawable/drop_sad" />
+
+</merge>