Color the ink drop ripple and hover effects based on theming.

ui/views/controls/button/custom_button.h

Index: ui/views/controls/button/custom_button.h
diff --git a/ui/views/controls/button/custom_button.h b/ui/views/controls/button/custom_button.h
index 36661c14a5c34b2259e22b62fb4d9b6528e8583a..1ec88a00b73dca1ddfcb144cb5af0ee628af4c40 100644
--- a/ui/views/controls/button/custom_button.h
+++ b/ui/views/controls/button/custom_button.h
@@ -72,6 +72,8 @@ class VIEWS_EXPORT CustomButton : public Button, public gfx::AnimationDelegate {
     notify_action_ = notify_action;
   }
 
+  void set_ink_drop_base_color(SkColor color) { ink_drop_base_color_ = color; }
+
   void SetHotTracked(bool is_hot_tracked);
   bool IsHotTracked() const;
 
@@ -96,6 +98,7 @@ class VIEWS_EXPORT CustomButton : public Button, public gfx::AnimationDelegate {
   void GetAccessibleState(ui::AXViewState* state) override;
   void VisibilityChanged(View* starting_from, bool is_visible) override;
   scoped_ptr<InkDropHover> CreateInkDropHover() const override;
+  SkColor GetInkDropBaseColor() const override;
 
   // Overridden from gfx::AnimationDelegate:
   void AnimationProgressed(const gfx::Animation* animation) override;
@@ -183,6 +186,9 @@ class VIEWS_EXPORT CustomButton : public Button, public gfx::AnimationDelegate {
   // is clicked.
   InkDropState ink_drop_action_on_click_;
 
+  // The color of the ripple and hover.
+  SkColor ink_drop_base_color_;
+
   DISALLOW_COPY_AND_ASSIGN(CustomButton);
 };