aura: Add images for rectangular shadows.

ui/resources/ui_resources.grd

Index: ui/resources/ui_resources.grd
diff --git a/ui/resources/ui_resources.grd b/ui/resources/ui_resources.grd
index 4f294d212d974325af603cfb7a4a7a6e6be7a5a4..bd875e77c508598c2f742081a635af7d1f14b517 100644
--- a/ui/resources/ui_resources.grd
+++ b/ui/resources/ui_resources.grd
@@ -136,6 +136,14 @@
         <include name="IDR_AURA_LAUNCHER_TABBED_BROWSER_2" file="aura/browser_instance_2.png" type="BINDATA" />
         <include name="IDR_AURA_LAUNCHER_TABBED_BROWSER_3" file="aura/browser_instance_3.png" type="BINDATA" />
         <include name="IDR_AURA_LAUNCHER_ICON_APPLIST" file="aura/applist.png" type="BINDATA" />
+        <include name="IDR_AURA_SHADOW_RECT_TOP_LEFT" file="aura/shadow_rect_top_left.png" type="BINDATA" />
+        <include name="IDR_AURA_SHADOW_RECT_TOP" file="aura/shadow_rect_top.png" type="BINDATA" />
+        <include name="IDR_AURA_SHADOW_RECT_TOP_RIGHT" file="aura/shadow_rect_top_right.png" type="BINDATA" />
+        <include name="IDR_AURA_SHADOW_RECT_LEFT" file="aura/shadow_rect_left.png" type="BINDATA" />
+        <include name="IDR_AURA_SHADOW_RECT_RIGHT" file="aura/shadow_rect_right.png" type="BINDATA" />
+        <include name="IDR_AURA_SHADOW_RECT_BOTTOM_LEFT" file="aura/shadow_rect_bottom_left.png" type="BINDATA" />
+        <include name="IDR_AURA_SHADOW_RECT_BOTTOM" file="aura/shadow_rect_bottom.png" type="BINDATA" />
+        <include name="IDR_AURA_SHADOW_RECT_BOTTOM_RIGHT" file="aura/shadow_rect_bottom_right.png" type="BINDATA" />
         <include name="IDR_AURA_STATUS_MOCK" file="aura/statusbar.png" type="BINDATA" />
         <include name="IDR_AURA_WALLPAPER" file="aura/damask.png" type="BINDATA" />
         <include name="IDR_AURA_WINDOW_CLOSE_ICON" file="aura/slab_close.png" type="BINDATA" />