Add a virtual keyboard webui at chrome://keyboard/

ui/keyboard/resources/images/shift-down.svg

Index: ui/keyboard/resources/images/shift-down.svg
diff --git a/ui/keyboard/resources/images/shift-down.svg b/ui/keyboard/resources/images/shift-down.svg
new file mode 100644
index 0000000000000000000000000000000000000000..958aa296473be8d8dd43ef2c1d19e8276a7017e4
--- /dev/null
+++ b/ui/keyboard/resources/images/shift-down.svg
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 14.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 43363)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="50px" height="50px" viewBox="10 10 30 30">
+<!-- TODO(fsamuel): remove the width and height workaround above after fixing SVG bug -->
+<g>
+	<path fill="#e0e0e0" d="M23,29.25c-0.138,0-0.25-0.112-0.25-0.25v-2.75H20c-0.101,0-0.192-0.061-0.231-0.154
+		s-0.017-0.201,0.054-0.272l5-5c0.049-0.049,0.113-0.073,0.177-0.073s0.128,0.024,0.177,0.073l5,5
+		c0.071,0.071,0.093,0.179,0.055,0.272c-0.039,0.093-0.13,0.154-0.231,0.154h-2.75V29c0,0.138-0.112,0.25-0.25,0.25H23z"/>
+	<path fill="#e0e0e0" d="M25,21l5,5h-3v3h-4v-3h-3L25,21 M25,20.5c-0.128,0-0.256,0.049-0.354,0.146l-5,5
+		c-0.143,0.143-0.186,0.358-0.108,0.545C19.615,26.377,19.797,26.5,20,26.5h2.5V29c0,0.276,0.224,0.5,0.5,0.5h4
+		c0.276,0,0.5-0.224,0.5-0.5v-2.5H30c0.202,0,0.385-0.122,0.462-0.309c0.077-0.187,0.034-0.402-0.108-0.545l-5-5
+		C25.255,20.548,25.127,20.5,25,20.5L25,20.5z"/>
+</g>
+</svg>