Revert of Introduces window_finder_android.cc

chrome/browser/ui/views/tabs/window_finder_ash.cc

 // Copyright 2014 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 "chrome/browser/ui/views/tabs/window_finder.h"
 
 #include "ash/shell_window_ids.h"
 #include "ash/wm/coordinate_conversion.h"
-#include "chrome/browser/ui/views/tabs/window_finder_impl.h"
+#include "ui/aura/client/screen_position_client.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_event_dispatcher.h"
+#include "ui/wm/core/window_util.h"
+
+namespace {
+
+gfx::NativeWindow GetLocalProcessWindowAtPointImpl(
+    const gfx::Point& screen_point,
+    const std::set<gfx::NativeWindow>& ignore,
+    gfx::NativeWindow window) {
+  if (ignore.find(window) != ignore.end())
+    return NULL;
+
+  if (!window->IsVisible())
+    return NULL;
+
+  if (window->id() == ash::kShellWindowId_PhantomWindow ||
+      window->id() == ash::kShellWindowId_OverlayContainer ||
+      window->id() == ash::kShellWindowId_MouseCursorContainer)
+    return NULL;
+
+  if (window->layer()->type() == ui::LAYER_TEXTURED) {
+    // Returns the window that has visible layer and can hit the
+    // |screen_point|, because we want to detach the tab as soon as
+    // the dragging mouse moved over to the window that can hide the
+    // moving tab.
+    aura::client::ScreenPositionClient* client =
+        aura::client::GetScreenPositionClient(window->GetRootWindow());
+    gfx::Point local_point = screen_point;
+    client->ConvertPointFromScreen(window, &local_point);
+    return window->GetEventHandlerForPoint(local_point) ? window : nullptr;
+  }
+
+  for (aura::Window::Windows::const_reverse_iterator i =
+           window->children().rbegin(); i != window->children().rend(); ++i) {
+    gfx::NativeWindow result =
+        GetLocalProcessWindowAtPointImpl(screen_point, ignore, *i);
+    if (result)
+      return result;
+  }
+  return NULL;
+}
+
+}  // namespace
 
 gfx::NativeWindow GetLocalProcessWindowAtPointAsh(
     const gfx::Point& screen_point,
     const std::set<gfx::NativeWindow>& ignore) {
-  gfx::NativeWindow window = ::ash::wm::GetRootWindowAt(screen_point);
-  std::set<int> ignore_ash_ids = {ash::kShellWindowId_PhantomWindow,
-                                  ash::kShellWindowId_OverlayContainer,
-                                  ash::kShellWindowId_MouseCursorContainer};
-  return GetLocalProcessWindowAtPointImpl(screen_point, ignore, ignore_ash_ids,
-                                          window);
+  return GetLocalProcessWindowAtPointImpl(
+      screen_point, ignore, ::ash::wm::GetRootWindowAt(screen_point));
 }