Draggable region support for frameless app window on CrOS.

ui/aura/window.cc

Index: ui/aura/window.cc
diff --git a/ui/aura/window.cc b/ui/aura/window.cc
index a36a9f169fd98761fc66201bbbd17ebe43415a24..2f241630a2ed22ee839bb5a9fa3485e948dfdfe9 100644
--- a/ui/aura/window.cc
+++ b/ui/aura/window.cc
@@ -501,12 +501,13 @@ bool Window::HitTest(const gfx::Point& local_point) {
       mask_region.contains(local_point.x(), local_point.y());
 }
 
-Window* Window::GetEventHandlerForPoint(const gfx::Point& local_point) {
-  return GetWindowForPoint(local_point, true, true);
+Window* Window::GetEventHandlerForPoint(const gfx::Point& local_point,
+                                        ui::EventType event_type) {
+  return GetWindowForPoint(local_point, true, event_type);
 }
 
 Window* Window::GetTopWindowContainingPoint(const gfx::Point& local_point) {
-  return GetWindowForPoint(local_point, false, false);
+  return GetWindowForPoint(local_point, false, ui::ET_UNKNOWN);
 }
 
 Window* Window::GetToplevelWindow() {
@@ -700,10 +701,11 @@ void Window::SchedulePaint() {
 
 Window* Window::GetWindowForPoint(const gfx::Point& local_point,
                                   bool return_tightest,
-                                  bool for_event_handling) {
+                                  ui::EventType event_type) {
   if (!IsVisible())
     return NULL;
 
+  bool for_event_handling = event_type != ui::ET_UNKNOWN;
   if ((for_event_handling && !HitTest(local_point)) ||
       (!for_event_handling && !ContainsPoint(local_point)))
     return NULL;
@@ -721,6 +723,16 @@ Window* Window::GetWindowForPoint(const gfx::Point& local_point,
       return delegate_ ? this : NULL;
   }
 
+  // Check if I should claim the mouse click/drag event and not pass it to my
+  // children because this location is inside the draggable region.
+  if (delegate_ &&
+      (event_type == ui::ET_MOUSE_PRESSED ||
+           event_type == ui::ET_MOUSE_DRAGGED ||
+           event_type == ui::ET_MOUSE_RELEASED) &&
+      draggable_region_.get() &&
+      draggable_region_->contains(local_point.x(), local_point.y()))
+    return this;
+
   if (!return_tightest && delegate_)
     return this;
 
@@ -751,7 +763,7 @@ Window* Window::GetWindowForPoint(const gfx::Point& local_point,
 
     Window* match = child->GetWindowForPoint(point_in_child_coords,
                                              return_tightest,
-                                             for_event_handling);
+                                             event_type);
     if (match)
       return match;
   }
@@ -941,6 +953,10 @@ bool Window::ContainsMouse() {
   return contains_mouse;
 }
 
+void Window::SetDraggableRegion(SkRegion* region) {
+  draggable_region_.reset(region);
+}
+
 #ifndef NDEBUG
 std::string Window::GetDebugInfo() const {
   return StringPrintf(