Add window position offset.

services/ui/ws/platform_display_default.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 "services/ui/ws/platform_display_default.h"
 
 #include "base/memory/ptr_util.h"
 #include "gpu/ipc/client/gpu_channel_host.h"
 #include "services/ui/display/screen_manager.h"
 #include "services/ui/ws/platform_display_init_params.h"
@@ skipping 151 matching lines @@
   return widget_;
 }
 
 void PlatformDisplayDefault::UpdateEventRootLocation(ui::LocatedEvent* event) {
   gfx::Point location = event->location();
   location.Offset(metrics_.bounds.x(), metrics_.bounds.y());
   event->set_root_location(location);
 }
 
 void PlatformDisplayDefault::OnBoundsChanged(const gfx::Rect& new_bounds) {
+  // Since we aren't resizing the Chrome OS display size, if the user resizes
+  // the window or the WM doesn't honor the requested size then cursor
+  // locations end up incorrect.
+  window_height_offset_ = new_bounds.height() - metrics_.pixel_size.height();
+
   // We only care if the window size has changed.
   if (new_bounds.size() == metrics_.pixel_size)
     return;
 
   // TODO(kylechar): Maybe do something here. For CrOS we don't need to support
   // PlatformWindow initiated resizes. For other platforms we need to do
   // something but that isn't fully flushed out.
 }
 
 void PlatformDisplayDefault::OnDamageRect(const gfx::Rect& damaged_region) {}
 
 void PlatformDisplayDefault::DispatchEvent(ui::Event* event) {
-  if (event->IsLocatedEvent())
-    UpdateEventRootLocation(event->AsLocatedEvent());
+  if (event->IsLocatedEvent()) {
+    ui::LocatedEvent* located_event = event->AsLocatedEvent();
+    gfx::PointF location = located_event->location_f();
+    location.Offset(0, -window_height_offset_);
+    located_event->set_location_f(location);
+    UpdateEventRootLocation(located_event);

[tonikitoo, 2017/01/13 17:07:14]

driven-by comment: maybe moving moving this offset-change code to within
::UpdateEventRootLocation, where LocatedEvent::root_location_ gets updated any
ways?

+  }
 
   if (event->IsScrollEvent()) {
     // TODO(moshayedi): crbug.com/602859. Dispatch scroll events as
     // they are once we have proper support for scroll events.
     delegate_->OnEvent(
         ui::PointerEvent(ui::MouseWheelEvent(*event->AsScrollEvent())));
   } else if (event->IsMouseEvent()) {
     delegate_->OnEvent(ui::PointerEvent(*event->AsMouseEvent()));
   } else if (event->IsTouchEvent()) {
     delegate_->OnEvent(ui::PointerEvent(*event->AsTouchEvent()));
@@ skipping 62 matching lines @@
 ServerWindow* PlatformDisplayDefault::GetActiveRootWindow() {
   return delegate_->GetActiveRootWindow();
 }
 
 bool PlatformDisplayDefault::IsInHighContrastMode() {
   return delegate_ ? delegate_->IsInHighContrastMode() : false;
 }
 
 }  // namespace ws
 }  // namespace ui