Fix cropped floating gesture candidate window

ui/keyboard/keyboard_controller_unittest.cc

 // Copyright (c) 2013 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/keyboard/keyboard_controller.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 78 matching lines @@
 class TestKeyboardUI : public KeyboardUI {
  public:
   TestKeyboardUI(ui::InputMethod* input_method) : input_method_(input_method) {}
   ~TestKeyboardUI() override {
     // Destroy the window before the delegate.
     window_.reset();
   }
 
   // Overridden from KeyboardUI:
   bool HasKeyboardWindow() const override { return window_; }
+  bool ShouldWindowOverscroll(aura::Window* window) const override {
+    return true;
+  }
   aura::Window* GetKeyboardWindow() override {
     if (!window_) {
       window_.reset(new aura::Window(&delegate_));
       window_->Init(ui::LAYER_NOT_DRAWN);
       window_->set_owned_by_parent(false);
     }
     return window_.get();
   }
   ui::InputMethod* GetInputMethod() override { return input_method_; }
   void SetUpdateInputType(ui::TextInputType type) override {}
@@ skipping 494 matching lines @@
   // Before hide animation finishes, show keyboard again.
   ShowKeyboard();
   RunAnimationForLayer(layer);
   EXPECT_TRUE(keyboard_container()->IsVisible());
   EXPECT_TRUE(keyboard_window()->IsVisible());
   EXPECT_EQ(1.0, layer->opacity());
   EXPECT_EQ(gfx::Transform(), layer->transform());
 }
 
 }  // namespace keyboard