Adds the ability for WebContentsDelegate to decide if event should be updated

content/browser/renderer_host/render_widget_host_view_event_handler.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_EVENT_HANDLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_EVENT_HANDLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 41 matching lines @@
     : public ui::EventHandler {
  public:
   // An interface to provide platform specific logic needed for event handling.
   class Delegate {
    public:
     Delegate();
 
     // Converts |rect| from window coordinate to screen coordinate.
     virtual gfx::Rect ConvertRectToScreen(const gfx::Rect& rect) const = 0;
     // Call keybindings handler against the event and send matched edit commands
-    // to the renderer instead.
-    virtual void ForwardKeyboardEvent(const NativeWebKeyboardEvent& event) = 0;
+    // to the renderer instead. |update_event| (if non-null) is set to indicate
+    // whether ui::KeyEvent::SetHandled() should be called on the underlying
+    // ui::KeyEvent.
+    virtual void ForwardKeyboardEvent(const NativeWebKeyboardEvent& event,
+                                      bool* update_event) = 0;
     // Returns whether the widget needs to grab mouse capture to work properly.
     virtual bool NeedsMouseCapture() = 0;
     virtual void SetTooltipsEnabled(bool enable) = 0;
     virtual void ShowContextMenu(const ContextMenuParams& params) = 0;
     // Sends shutdown request.
     virtual void Shutdown() = 0;
 
     ui::TouchSelectionController* selection_controller() const {
       return selection_controller_.get();
     }
@@ skipping 169 matching lines @@
   ui::EventHandler* popup_child_event_handler_;
   Delegate* const delegate_;
   aura::Window* window_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewEventHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_EVENT_HANDLER_H_