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

ash/host/ash_window_tree_host_ozone.cc

Index: ash/host/ash_window_tree_host_ozone.cc
diff --git a/ash/host/ash_window_tree_host_ozone.cc b/ash/host/ash_window_tree_host_ozone.cc
index 6b24015d06442d2060690eb0bd319db39b282f9f..7b0dd1d240bae208db66156acebb5fa5d852f828 100644
--- a/ash/host/ash_window_tree_host_ozone.cc
+++ b/ash/host/ash_window_tree_host_ozone.cc
@@ -8,6 +8,7 @@
 #include "ash/host/root_window_transformer.h"
 #include "ash/host/transformer_helper.h"
 #include "base/command_line.h"
+#include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/window_tree_host_ozone.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/transform.h"
@@ -21,6 +22,9 @@ class AshWindowTreeHostOzone : public AshWindowTreeHost,
   explicit AshWindowTreeHostOzone(const gfx::Rect& initial_bounds);
   virtual ~AshWindowTreeHostOzone();
 
+ protected:
+  void TranslateLocatedEvent(ui::LocatedEvent* event) OVERRIDE;
+
  private:
   // AshWindowTreeHost:
   virtual void ToggleFullScreen() OVERRIDE;
@@ -87,6 +91,30 @@ void AshWindowTreeHostOzone::UpdateRootWindowSize(const gfx::Size& host_size) {
   transformer_helper_.UpdateWindowSize(host_size);
 }
 
+void AshWindowTreeHostOzone::TranslateLocatedEvent(ui::LocatedEvent* event) {
+  if (!event->IsTouchEvent()) {
+    aura::Window* root_window = window();
+    aura::client::ScreenPositionClient* screen_position_client =
+        aura::client::GetScreenPositionClient(root_window);
+    gfx::Rect local(bounds().size());
+
+    local.Inset(transformer_helper_.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);
+      ConvertPointToHost(&location);
+      event->set_location(location);
+      event->set_root_location(location);
+    }
+  }
+}
+
 }  // namespace
 
 AshWindowTreeHost* AshWindowTreeHost::Create(