Don't send touch events to windows like menus when the touch occurs outside the menu bounds.

ui/views/controls/menu/menu_controller.cc

Index: ui/views/controls/menu/menu_controller.cc
diff --git a/ui/views/controls/menu/menu_controller.cc b/ui/views/controls/menu/menu_controller.cc
index cae826f46607a06da30b946d49b0ec98578cb9e4..740c328cfbcbd754fba99d8842f510f3965163ba 100644
--- a/ui/views/controls/menu/menu_controller.cc
+++ b/ui/views/controls/menu/menu_controller.cc
@@ -10,6 +10,8 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/window_tree_host.h"
 #include "ui/base/dragdrop/drag_utils.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/events/event.h"
@@ -1215,6 +1217,13 @@ MenuController::~MenuController() {
 }
 
 void MenuController::RunMessageLoop(bool nested_menu) {
+#if defined(OS_WIN)
+  // Menus should be dismissed if we touch outside their bounds.
+  if (owner_ && owner_->GetNativeView()) {
+    owner_->GetNativeView()->SetProperty(
+        aura::client::kReleaseCaptureOnTouchOutside, true);
+  }
+#endif
   message_loop_->Run(this, owner_, nested_menu);
 }
 
@@ -2428,6 +2437,10 @@ MenuItemView* MenuController::ExitMenuRun() {
   SetSelection(nullptr, SELECTION_UPDATE_IMMEDIATELY | SELECTION_EXIT);
 
 #if defined(OS_WIN)
+  if (owner_ && owner_->GetNativeView()) {
+    owner_->GetNativeView()->ClearProperty(
+        aura::client::kReleaseCaptureOnTouchOutside);
+  }
   // On Windows, if we select the menu item by touch and if the window at the
   // location is another window on the same thread, that window gets a
   // WM_MOUSEACTIVATE message and ends up activating itself, which is not