Audit all of sky's system <> style includes

sky/engine/public/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//tools/grit/grit_rule.gni")
 
 group("test_support") {
   deps = [
     "//sky/engine/web:test_support",
   ]
 }
 
 config("sky_headers_config") {
   include_dirs = [ ".." ]
 }
 
 # Depend on this target to use public sky API headers for things like enums
 # and public structures without actually linking against any Blink libraries.
 source_set("sky_headers") {
   direct_dependent_configs = [
     ":sky_headers_config",
   ]
 
+  deps = [
+    "//ui/gfx/geometry",
+  ]
+
   public = [
     "platform/Platform.h",
     "platform/ServiceProvider.h",
     "platform/WebArrayBuffer.h",
     "platform/WebBlendMode.h",
     "platform/WebCString.h",
     "platform/WebCallbacks.h",
     "platform/WebCanvas.h",
     "platform/WebClipboard.h",
     "platform/WebColor.h",
@@ skipping 128 matching lines @@
     "web/WebURLLoaderOptions.h",
     "web/WebUserGestureIndicator.h",
     "web/WebUserGestureToken.h",
     "web/WebView.h",
     "web/WebViewClient.h",
     "web/WebWidget.h",
     "web/WebWidgetClient.h",
     "web/linux/WebFontRendering.h",
   ]
 }