Laser tool blocks events from propagating.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 9838d51824d8a8eca7f64159f1cb624cc639a37d..b530a255e0a97d6aa7497a482711a9e4d18ad22c 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -53,6 +53,7 @@
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/host/ash_window_tree_host_init_params.h"
 #include "ash/ime/input_method_event_handler.h"
+#include "ash/laser/laser_pointer_controller.h"
 #include "ash/magnifier/magnification_controller.h"
 #include "ash/magnifier/partial_magnification_controller.h"
 #include "ash/root_window_controller.h"
@@ -566,6 +567,7 @@ Shell::~Shell() {
   // These need a valid Shell instance to clean up properly, so explicitly
   // delete them before invalidating the instance.
   // Alphabetical. TODO(oshima): sort.
+  laser_pointer_controller_.reset();
   magnification_controller_.reset();
   partial_magnification_controller_.reset();
   tooltip_controller_.reset();
@@ -822,6 +824,8 @@ void Shell::Init(const ShellInitParams& init_params) {
   // RootWindowController as possible.
   visibility_controller_.reset(new AshVisibilityController);
 
+  laser_pointer_controller_.reset(new LaserPointerController());
+
   magnification_controller_.reset(MagnificationController::CreateInstance());
   wm_shell_->CreateMruWindowTracker();