Add window position offset.

services/ui/ws/platform_display_default.cc

Index: services/ui/ws/platform_display_default.cc
diff --git a/services/ui/ws/platform_display_default.cc b/services/ui/ws/platform_display_default.cc
index ba50d304de71e5c49d5ddb1ad6b59cdc2821b125..41dbf48055ed235aaa9cef30b76bf6362a606835 100644
--- a/services/ui/ws/platform_display_default.cc
+++ b/services/ui/ws/platform_display_default.cc
@@ -169,6 +169,11 @@ void PlatformDisplayDefault::UpdateEventRootLocation(ui::LocatedEvent* event) {
 }
 
 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;
@@ -181,8 +186,13 @@ void PlatformDisplayDefault::OnBoundsChanged(const gfx::Rect& new_bounds) {
 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