Don't request wheel or touch events when the view of pepper has no area.

content/renderer/pepper/pepper_plugin_instance_impl.h

 // Copyright (c) 2012 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_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 615 matching lines @@
 
   // Update any transforms that should be applied to the texture layer.
   void UpdateLayerTransform();
 
   // Determines if we think the plugin has focus, both content area and webkit
   // (see has_webkit_focus_ below).
   bool PluginHasFocus() const;
   void SendFocusChangeNotification();
 
   void UpdateTouchEventRequest();
-
-  // Returns true if the plugin has registered to accept wheel events.
-  bool IsAcceptingWheelEvents() const;
+  void UpdateWheelEventRequest();
 
   void ScheduleAsyncDidChangeView();
   void SendAsyncDidChangeView();
   void SendDidChangeView();
 
   // Reports the current plugin geometry to the plugin by calling
   // DidChangeView.
   void ReportGeometry();
 
   // Queries the plugin for supported print formats and sets |format| to the
@@ skipping 340 matching lines @@
   // view change events.
   base::WeakPtrFactory<PepperPluginInstanceImpl> view_change_weak_ptr_factory_;
   base::WeakPtrFactory<PepperPluginInstanceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPluginInstanceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_