ash: ozone: apply transformation to events outside the root window

ash/host/ash_window_tree_host.cc

Index: ash/host/ash_window_tree_host.cc
diff --git a/ash/host/ash_window_tree_host.cc b/ash/host/ash_window_tree_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..916f5d848c435a451be40661f2180b8072e4316f
--- /dev/null
+++ b/ash/host/ash_window_tree_host.cc
@@ -0,0 +1,39 @@
+// 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 "ash/host/ash_window_tree_host.h"
+
+#include "ui/aura/client/screen_position_client.h"
+#include "ui/aura/window_tree_host.h"
+#include "ui/events/event.h"
+#include "ui/gfx/rect.h"
+
+namespace ash {
+
+void AshWindowTreeHost::TranslateLocatedEvent(ui::LocatedEvent* event) {
+  if (event->IsTouchEvent())
+    return;
+
+  aura::WindowTreeHost* wth = AsWindowTreeHost();
+  aura::Window* root_window = wth->window();
+  aura::client::ScreenPositionClient* screen_position_client =
+      aura::client::GetScreenPositionClient(root_window);
+  gfx::Rect local(wth->GetBounds().size());
+  local.Inset(GetHostInsets());
+
+  if (screen_position_client && !local.Contains(event->location())) {
+    gfx::Point location(event->location());
+    // In order to get the correct point in screen coordinates
+    // during passive grab, we first need to find on which host window
+    // the mouse is on, and find out the screen coordinates on that
+    // host window, then convert it back to this host window's coordinate.
+    screen_position_client->ConvertHostPointToScreen(root_window, &location);
+    screen_position_client->ConvertPointFromScreen(root_window, &location);
+    wth->ConvertPointToHost(&location);
+    event->set_location(location);
+    event->set_root_location(location);
+  }
+}
+
+}  // namespace ash