Add VectorIconButton functionality to ImageButton.

ui/views/controls/button/image_button_unittest.cc

Index: ui/views/controls/button/image_button_unittest.cc
diff --git a/ui/views/controls/button/image_button_unittest.cc b/ui/views/controls/button/image_button_unittest.cc
index ccd62cef04682685788478535da0493b1d1f3205..320a8f2708bd9e970092a6b2100ec51c9b2fe210 100644
--- a/ui/views/controls/button/image_button_unittest.cc
+++ b/ui/views/controls/button/image_button_unittest.cc
@@ -2,11 +2,13 @@
 // 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/image_button.h"
+
 #include "base/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/layout.h"
+#include "ui/vector_icons/vector_icons.h"
 #include "ui/views/border.h"
-#include "ui/views/controls/button/image_button.h"
 #include "ui/views/test/views_test_base.h"
 
 namespace {
@@ -199,4 +201,16 @@ TEST_F(ImageButtonTest, PreferredSizeInvalidation) {
   EXPECT_EQ(1, parent.pref_size_changed_calls());
 }
 
+TEST_F(ImageButtonTest, Padding) {
+  ImageButton button(nullptr);
+  gfx::ImageSkia image = CreateTestImage(5, 10);
+  button.SetImage(CustomButton::STATE_NORMAL, &image);
+
+  button.SetPadding(gfx::Insets(2, 5, 7, 13));
+  EXPECT_EQ("23x19", button.GetPreferredSize().ToString());
+
+  button.SetPadding(gfx::Insets());
+  EXPECT_EQ("5x10", button.GetPreferredSize().ToString());
+}
+
 }  // namespace views