fuchsia: stub ui/base/cursor/cursor_loader

Fuchsia is initially trying to get a headless build up and
running so cursors are unnecessary.

Bug: 743296
Change-Id: Ia2093400215a00f8dabfbd1365baa4b5f58a556b
Reviewed-on: https://chromium-review.googlesource.com/596950
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491449}

ui/base/BUILD.gn

@@ -645,6 +645,10 @@ component("base") {
   if (is_android || is_ios) {
     sources -= [ "device_form_factor_desktop.cc" ]
   }
+
+  if (is_fuchsia) {
+    sources += [ "cursor/cursor_loader_fuchsia.cc" ]
+  }
 }
 
 static_library("test_support") {

ui/base/cursor/cursor_loader.h

@@ -8,6 +8,7 @@
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
+#include "ui/base/cursor/cursor_type.h"
 #include "ui/base/ui_base_export.h"
 #include "ui/display/display.h"
 #include "ui/gfx/geometry/point.h"

ui/base/cursor/cursor_loader_fuchsia.cc

+// Copyright 2017 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.
+
+#include "ui/base/cursor/cursor_loader.h"
+
+#include "base/logging.h"
+
+namespace ui {
+
+CursorLoader* CursorLoader::Create() {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+}  // namespace ui