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

content/browser/renderer_host/render_widget_host_view_event_handler.cc

 // 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 "content/browser/renderer_host/render_widget_host_view_event_handler.h"
 
 #include "base/metrics/user_metrics_action.h"
 #include "content/browser/renderer_host/input/touch_selection_controller_client_aura.h"
 #include "content/browser/renderer_host/overscroll_controller.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
@@ skipping 230 matching lines @@
 
 void RenderWidgetHostViewEventHandler::OnKeyEvent(ui::KeyEvent* event) {
   TRACE_EVENT0("input", "RenderWidgetHostViewBase::OnKeyEvent");
 
   if (NeedsInputGrab(popup_child_host_view_)) {
     popup_child_event_handler_->OnKeyEvent(event);
     if (event->handled())
       return;
   }
 
+  bool mark_event_as_handled = true;
   // We need to handle the Escape key for Pepper Flash.
   if (host_view_->is_fullscreen() && event->key_code() == ui::VKEY_ESCAPE) {
     // Focus the window we were created from.
     if (host_tracker_.get() && !host_tracker_->windows().empty()) {
       aura::Window* host = *(host_tracker_->windows().begin());
       aura::client::FocusClient* client = aura::client::GetFocusClient(host);
       if (client) {
         // Calling host->Focus() may delete |this|. We create a local observer
         // for that. In that case we exit without further access to any members.
         auto local_tracker = std::move(host_tracker_);
@@ skipping 15 matching lines @@
       // Accept return key character events between press and release events.
       accept_return_character_ = event->type() == ui::ET_KEY_PRESSED;
     }
 
     // Call SetKeyboardFocus() for not only ET_KEY_PRESSED but also
     // ET_KEY_RELEASED. If a user closed the hotdog menu with ESC key press,
     // we need to notify focus to Blink on ET_KEY_RELEASED for ESC key.
     SetKeyboardFocus();
     // We don't have to communicate with an input method here.
     NativeWebKeyboardEvent webkit_event(*event);
-    delegate_->ForwardKeyboardEvent(webkit_event);
+    delegate_->ForwardKeyboardEvent(webkit_event, &mark_event_as_handled);
   }
-  event->SetHandled();
+  if (mark_event_as_handled)
+    event->SetHandled();
 }
 
 void RenderWidgetHostViewEventHandler::OnMouseEvent(ui::MouseEvent* event) {
   TRACE_EVENT0("input", "RenderWidgetHostViewBase::OnMouseEvent");
   ForwardMouseEventToParent(event);
   // TODO(mgiuca): Return if event->handled() returns true. This currently
   // breaks drop-down lists which means something is incorrectly setting
   // event->handled to true (http://crbug.com/577983).
 
   if (mouse_locked_) {
@@ skipping 568 matching lines @@
   host_->ForwardWheelEventWithLatencyInfo(event, latency);
 }
 
 void RenderWidgetHostViewEventHandler::ProcessTouchEvent(
     const blink::WebTouchEvent& event,
     const ui::LatencyInfo& latency) {
   host_->ForwardTouchEventWithLatencyInfo(event, latency);
 }
 
 }  // namespace content