MacViews: draw Mac combobox arrows

ui/views/style/platform_style_mac.mm

Index: ui/views/style/platform_style_mac.mm
diff --git a/ui/views/style/platform_style_mac.mm b/ui/views/style/platform_style_mac.mm
index 1fb13f32a554ed486c3021b84e7bd534ac77104f..cbe9be51ce15d0094f4546ee536b1cf0bf603def 100644
--- a/ui/views/style/platform_style_mac.mm
+++ b/ui/views/style/platform_style_mac.mm
@@ -4,6 +4,10 @@
 
 #include "ui/views/style/platform_style.h"
 
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/paint_vector_icon.h"
+#include "ui/gfx/vector_icons.h"
+#include "ui/resources/grit/ui_resources.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/controls/button/label_button_border.h"
 #include "ui/views/controls/focusable_rounded_border_mac.h"
@@ -14,6 +18,21 @@
 namespace views {
 
 // static
+gfx::ImageSkia PlatformStyle::CreateComboboxArrow(bool is_enabled,
+                                                  Combobox::Style style) {
+  // TODO(ellyjones): IDR_MENU_DROPARROW is a cross-platform image that doesn't
+  // look right on Mac. See https://crbug.com/384071.
+  if (style == Combobox::STYLE_ACTION) {
+    ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+    return *rb.GetImageSkiaNamed(IDR_MENU_DROPARROW);
+  }
+  const int kComboboxArrowWidth = 13;
+  return gfx::CreateVectorIcon(gfx::VectorIconId::COMBOBOX_ARROW_MAC,
+                               kComboboxArrowWidth,
+                               is_enabled ? SK_ColorWHITE : SK_ColorBLACK);
+}
+
+// static
 scoped_ptr<FocusableBorder> PlatformStyle::CreateComboboxBorder() {
   return make_scoped_ptr(new FocusableRoundedBorder);
 }