[ash-md] Added different highlighting modes to the InkDropImpl.

ui/views/controls/button/md_text_button.cc

Index: ui/views/controls/button/md_text_button.cc
diff --git a/ui/views/controls/button/md_text_button.cc b/ui/views/controls/button/md_text_button.cc
index 7d160e840076334df11e440708e405af23118de2..1931f5bc210f0e23a13fc7d57aaffef6089a2fe9 100644
--- a/ui/views/controls/button/md_text_button.cc
+++ b/ui/views/controls/button/md_text_button.cc
@@ -12,6 +12,7 @@
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/animation/flood_fill_ink_drop_ripple.h"
 #include "ui/views/animation/ink_drop_highlight.h"
+#include "ui/views/animation/ink_drop_impl.h"
 #include "ui/views/animation/ink_drop_painted_layer_delegates.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
@@ -121,6 +122,10 @@ SkColor MdTextButton::GetInkDropBaseColor() const {
   return color_utils::DeriveDefaultIconColor(label()->enabled_color());
 }
 
+std::unique_ptr<InkDrop> MdTextButton::CreateInkDrop() {
+  return CreateDefaultFloodFillInkDropImpl();
+}
+
 std::unique_ptr<views::InkDropRipple> MdTextButton::CreateInkDropRipple()
     const {
   return std::unique_ptr<views::InkDropRipple>(
@@ -136,9 +141,6 @@ void MdTextButton::StateChanged() {
 
 std::unique_ptr<views::InkDropHighlight> MdTextButton::CreateInkDropHighlight()
     const {
-  if (!ShouldShowInkDropHighlight())
-    return nullptr;
-
   // The prominent button hover effect is a shadow.
   const int kYOffset = 1;
   const int kSkiaBlurRadius = 2;