Moves ImmersiveFullscreenController::SetupForTest into test class

ash/test/immersive_fullscreen_controller_test_api.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 "ash/test/immersive_fullscreen_controller_test_api.h"
+
+#include "ash/common/wm/immersive/wm_immersive_fullscreen_controller_delegate.h"
+#include "ash/wm/immersive_fullscreen_controller.h"
+#include "ui/aura/env.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace ash {
+
+ImmersiveFullscreenControllerTestApi::ImmersiveFullscreenControllerTestApi(
+    ImmersiveFullscreenController* controller)
+    : immersive_fullscreen_controller_(controller) {}
+
+ImmersiveFullscreenControllerTestApi::~ImmersiveFullscreenControllerTestApi() {}
+
+void ImmersiveFullscreenControllerTestApi::SetupForTest() {
+  DCHECK(!immersive_fullscreen_controller_->enabled_);
+  immersive_fullscreen_controller_->animations_disabled_for_test_ = true;
+
+  // Move the mouse off of the top-of-window views so that it does not keep the
+  // top-of-window views revealed.
+  std::vector<gfx::Rect> bounds_in_screen(
+      immersive_fullscreen_controller_->delegate_->GetVisibleBoundsInScreen());
+  DCHECK(!bounds_in_screen.empty());
+  int bottommost_in_screen = bounds_in_screen[0].bottom();
+  for (size_t i = 1; i < bounds_in_screen.size(); ++i) {
+    if (bounds_in_screen[i].bottom() > bottommost_in_screen)
+      bottommost_in_screen = bounds_in_screen[i].bottom();
+  }
+  gfx::Point cursor_pos(0, bottommost_in_screen + 100);

[msw, 2016/08/18 22:59:34]

optional nit: 100 might be excessive here; I've seen tests start up with 200x300
or similar display sizes. This might push the cursor offscreen (perhaps not) or
onto some shelf control or something (perhaps okay), but don't we really only
need a 1px buffer here? Can we just center the cursor on the screen? (I just
realized this is the existing code, so you can just ignore these thoughts!)

[sky, 2016/08/18 23:24:01]

I actually don't think there is a reason to make it 100. 10 is likely good
enough. Lets see what the bots say about 10.

+  aura::Env::GetInstance()->set_last_mouse_location(cursor_pos);
+  immersive_fullscreen_controller_->UpdateLocatedEventRevealedLock();
+}
+
+}  // namespace ash