Fix the crash that happens when touch device is re-enabled.

This is part of previous changes. We need to call wl_pointer_destroy to release the wl_pointer device when pointer(mouse) device is disabled.

BUT=TC-1729

Author: yejingfu

wayland/input/pointer.cc

@@ -17,11 +17,14 @@ namespace ozonewayland {
 WaylandPointer::WaylandPointer()
   : cursor_(NULL),
     dispatcher_(NULL),
-    pointer_position_(0, 0) {
+    pointer_position_(0, 0),
+    input_pointer_(NULL) {
 }
 
 WaylandPointer::~WaylandPointer() {
   delete cursor_;
+  if (input_pointer_)
+    wl_pointer_destroy(input_pointer_);
 }
 
 void WaylandPointer::OnSeatCapabilities(wl_seat *seat, uint32_t caps) {
@@ -39,10 +42,10 @@ void WaylandPointer::OnSeatCapabilities(wl_seat *seat, uint32_t caps) {
   dispatcher_ = ui::EventFactoryOzoneWayland::GetInstance()->EventConverter();
 
   if ((caps & WL_SEAT_CAPABILITY_POINTER) && !cursor_->GetInputPointer()) {
-    wl_pointer* input_pointer = wl_seat_get_pointer(seat);
-      cursor_->SetInputPointer(input_pointer);
-    wl_pointer_set_user_data(input_pointer, this);
-    wl_pointer_add_listener(input_pointer, &kInputPointerListener, this);
+    input_pointer_ = wl_seat_get_pointer(seat);
+      cursor_->SetInputPointer(input_pointer_);
+    wl_pointer_set_user_data(input_pointer_, this);
+    wl_pointer_add_listener(input_pointer_, &kInputPointerListener, this);
   } else if (!(caps & WL_SEAT_CAPABILITY_POINTER)
                 && cursor_->GetInputPointer()) {
     cursor_->SetInputPointer(NULL);

wayland/input/pointer.h

@@ -68,6 +68,7 @@ class WaylandPointer {
   // dispatch this with events such as wheel or button which don't have a
   // position associated on Wayland.
   gfx::Point pointer_position_;
+  struct wl_pointer *input_pointer_;
 
   DISALLOW_COPY_AND_ASSIGN(WaylandPointer);
 };