Introduce some util code for drawing vector assets.

ui/gfx/BUILD.gn

Index: ui/gfx/BUILD.gn
diff --git a/ui/gfx/BUILD.gn b/ui/gfx/BUILD.gn
index b6468d932b82c282852a281d4cf715123f88d8d2..720c520d7432d868d2dda82bf4d253b9e05fcfa6 100644
--- a/ui/gfx/BUILD.gn
+++ b/ui/gfx/BUILD.gn
@@ -210,6 +210,8 @@ component("gfx") {
     "ui_gfx_exports.cc",
     "utf16_indexing.cc",
     "utf16_indexing.h",
+    "vector_icons.cc",
+    "vector_icons.h",
     "vsync_provider.h",
     "win/direct_write.cc",
     "win/direct_write.h",
@@ -321,6 +323,14 @@ component("gfx") {
     sources -= [ "canvas_notimplemented.cc" ]
   }
 
+  # Non desktop.
+  if (is_ios || is_android) {
+    sources -= [
+      "vector_icons.cc",
+      "vector_icons.h",
+    ]
+  }
+
   # Windows.
   if (is_win) {
     cflags = [ "/wd4324" ]  # Structure was padded due to __declspec(align()), which is