Fixes ink drop being "stuck" on when losing focus.

ui/views/animation/test/test_ink_drop_delegate.cc

 // Copyright 2016 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/animation/ink_drop.h"
 #include "ui/views/animation/test/test_ink_drop_delegate.h"
 
 namespace views {
 namespace test {
 
+class TestInkDrop : public InkDrop {
+ public:
+  TestInkDrop() : InkDrop() {}
+  ~TestInkDrop() override {}
+
+  InkDropState GetTargetInkDropState() const override {
+    NOTREACHED();
+    return InkDropState::HIDDEN;
+  }
+
+  bool IsVisible() const override {
+    NOTREACHED();
+    return false;
+  }
+  void AnimateToState(InkDropState ink_drop_state) override { NOTREACHED(); }
+  void SnapToActivated() override { NOTREACHED(); }
+  void SetHovered(bool is_hovered) override { NOTREACHED(); }
+  void SetFocused(bool is_focused) override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestInkDrop);
+};
+
 TestInkDropDelegate::TestInkDropDelegate()
     : state_(InkDropState::HIDDEN), is_hovered_(false) {}
 
 TestInkDropDelegate::~TestInkDropDelegate() {}
 
 void TestInkDropDelegate::OnAction(InkDropState state) {
   state_ = state;
 }
 
 void TestInkDropDelegate::SnapToActivated() {
   state_ = InkDropState::ACTIVATED;
 }
 
 void TestInkDropDelegate::SetHovered(bool is_hovered) {
   is_hovered_ = is_hovered;
 }
 
 InkDropState TestInkDropDelegate::GetTargetInkDropState() const {
   return state_;
 }
 
 InkDrop* TestInkDropDelegate::GetInkDrop() {
-  return nullptr;
+  if (!ink_drop_.get())
+    ink_drop_.reset(new TestInkDrop);
+  return ink_drop_.get();
 }
 
 }  // namespace test
 }  // namespace views