aura-x11: Add custom web cursor support.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 88983f89948d4adfcbc6d10eb8ff694505c5adbf..8ceae78d2a538d8e6dd2376319d3cd74b848c5a3 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -997,7 +997,10 @@ void RenderWidgetHostViewAura::UpdateCursorIfOverSelf() {
   if (is_loading_ && cursor == aura::kCursorPointer)
     cursor = aura::kCursorProgress;
 
-  root_window->SetCursor(cursor);
+  if (cursor == aura::kCursorCustom)
+    root_window->SetCustomCursor(current_cursor_.GetPlatformCursor());
+  else
+    root_window->SetCursor(cursor);
 }
 
 ui::InputMethod* RenderWidgetHostViewAura::GetInputMethod() const {