Don't count browser shortcut events as being user gestures.

third_party/WebKit/Source/core/input/KeyboardEventManager.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "KeyboardEventManager.h"
 
 #include <memory>
 
 #include "core/dom/Element.h"
 #include "core/dom/UserGestureIndicator.h"
@@ skipping 173 matching lines @@
   }
 
   // Check for cases where we are too early for events -- possible unmatched key
   // up from pressing return in the location bar.
   Node* node = EventTargetNodeForDocument(frame_->GetDocument());
   if (!node)
     return WebInputEventResult::kNotHandled;
 
   // To be meaningful enough to indicate user intention, a keyboard event needs
   // - not to be a modifier event
+  // - not to be a browser shortcut
   // https://crbug.com/709765
   bool is_modifier =
       Platform::Current()->IsDomKeyForModifier(initial_key_event.dom_key);
+  bool is_browser_shortcut = initial_key_event.is_browser_shortcut;
 
   std::unique_ptr<UserGestureIndicator> gesture_indicator;
-  if (!is_modifier) {
+  if (!is_modifier && !is_browser_shortcut) {
     gesture_indicator.reset(new UserGestureIndicator(
         UserGestureToken::Create(frame_->GetDocument())));
   }
 
   // In IE, access keys are special, they are handled after default keydown
   // processing, but cannot be canceled - this is hard to match.  On Mac OS X,
   // we process them before dispatching keydown, as the default keydown handler
   // implements Emacs key bindings, which may conflict with access keys. Then we
   // dispatch keydown, but suppress its default handling.
   // On Windows, WebKit explicitly calls handleAccessKey() instead of
@@ skipping 252 matching lines @@
   if (current_modifiers & ::cmdKey)
     modifiers |= WebInputEvent::kMetaKey;
 #else
   // TODO(crbug.com/538289): Implement on other platforms.
   return static_cast<WebInputEvent::Modifiers>(0);
 #endif
   return static_cast<WebInputEvent::Modifiers>(modifiers);
 }
 
 }  // namespace blink