Laser tool blocks events from propagating.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 728ae6a11a518958d8470ddb57df09556d6883f7..4411076684a250e7a9e9d952c26ae39482a4bf65 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -52,6 +52,7 @@
 #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"
@@ -609,6 +610,7 @@ 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();
@@ -865,6 +867,8 @@ 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();