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/test/test_ink_drop.h"
 #include "ui/views/animation/test/test_ink_drop_delegate.h"
 
 namespace views {
 namespace test {
 
 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_ = base::WrapUnique(new TestInkDrop());

[sky, 2016/06/02 02:01:40]

nit: ink_drop.reset(new TestInkDrop); is shorter and more concise.

Also, I'm not sure if this should be added. Wait for Ben to review this.

+  return ink_drop_.get();
 }
 
 }  // namespace test
 }  // namespace views