[Views] Update ink drop for omnibox icons

ui/views/animation/ink_drop.h

Index: ui/views/animation/ink_drop.h
diff --git a/ui/views/animation/ink_drop.h b/ui/views/animation/ink_drop.h
index 0eb419e11105867f8c25447dee516146f55fd213..ba0d88356fa73e93495fa8246b7e3b5382656c55 100644
--- a/ui/views/animation/ink_drop.h
+++ b/ui/views/animation/ink_drop.h
@@ -19,11 +19,13 @@
 
 namespace views {
 
+class InkDropObserver;
+
 // Pure virtual base class that manages the lifetime and state of an ink drop

[bruthig, 2017/04/21 15:05:10]

Can you update the docs?  This is no longer a pure-virtual class.

[spqchan, 2017/04/27 21:40:06]

Done.

 // ripple as well as visual hover state feedback.
 class VIEWS_EXPORT InkDrop {
  public:
-  virtual ~InkDrop() {}
+  virtual ~InkDrop();
 
   // Called by ink drop hosts when their size is changed.
   virtual void HostSizeChanged(const gfx::Size& new_size) = 0;
@@ -46,10 +48,24 @@ class VIEWS_EXPORT InkDrop {
   // Enables or disables the focus state.
   virtual void SetFocused(bool is_focused) = 0;
 
+  // Returns true if the highlight animation is in the process of fading in or
+  // is visible.
+  virtual bool IsHighlightFadingInOrVisible() const = 0;
+
+  // Methods to add/remove observers for this object.
+  void AddObserver(InkDropObserver* observer);
+  void RemoveObserver(InkDropObserver* observer);
+
  protected:
-  InkDrop() {}
+  InkDrop();
+
+  const base::ObserverList<InkDropObserver>* observers() const {
+    return &observers_;
+  }
 
  private:
+  base::ObserverList<InkDropObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(InkDrop);
 };