Add VectorIconButton functionality to ImageButton.

ui/views/controls/button/vector_icon_button.cc

 // Copyright 2015 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/views/controls/button/vector_icon_button.h"
 
 #include "ui/gfx/color_palette.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/paint_vector_icon.h"
-#include "ui/views/border.h"
 #include "ui/views/controls/button/vector_icon_button_delegate.h"
 #include "ui/views/painter.h"
+#include "ui/views/views_delegate.h"
 
 namespace views {
 
-namespace {
-
-// Extra space around the buttons to increase their event target size.
-const int kButtonExtraTouchSize = 4;
-
-}  // namespace
-
 VectorIconButton::VectorIconButton(VectorIconButtonDelegate* delegate)
     : ImageButton(delegate), delegate_(delegate), icon_(&gfx::kNoneIcon) {
   SetInkDropMode(InkDropMode::ON);
   set_has_ink_drop_action_on_click(true);
   SetImageAlignment(ImageButton::ALIGN_CENTER, ImageButton::ALIGN_MIDDLE);
   SetFocusPainter(nullptr);
+  SetPadding(ViewsDelegate::GetInstance()->GetButtonMargins());
 }
 
 VectorIconButton::~VectorIconButton() {}
 
 void VectorIconButton::SetIcon(const gfx::VectorIcon& icon) {
   icon_ = &icon;
-  OnSetIcon();
+  UpdateImagesAndColors();
 }
 
 void VectorIconButton::OnThemeChanged() {
   UpdateImagesAndColors();
 }
 
 void VectorIconButton::OnNativeThemeChanged(const ui::NativeTheme* theme) {
   UpdateImagesAndColors();
 }
 
-void VectorIconButton::OnSetIcon() {
-  if (!border())
-    SetBorder(CreateEmptyBorder(gfx::Insets(kButtonExtraTouchSize)));
-
-  UpdateImagesAndColors();
-}
-
 void VectorIconButton::UpdateImagesAndColors() {
+  if (!icon_)
+    return;
+
   SkColor icon_color =
       color_utils::DeriveDefaultIconColor(delegate_->GetVectorIconBaseColor());
   SkColor disabled_color = SkColorSetA(icon_color, 0xff / 2);
   SetImage(CustomButton::STATE_NORMAL,
            gfx::CreateVectorIcon(*icon_, icon_color));
   SetImage(CustomButton::STATE_DISABLED,
            gfx::CreateVectorIcon(*icon_, disabled_color));
   set_ink_drop_base_color(icon_color);
 }
 
 }  // namespace views