Add runtime setting to force passive event listeners.

third_party/WebKit/public/web/WebSettings.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 77 matching lines @@
     // Defines user preference for text track kind.
     enum class TextTrackKindUserPreference {
         // Display only tracks marked as default
         Default,
         // If available, display captions track in preferred language, else display subtitles.
         Captions,
         // If available, display subtitles track in preferred language, else display captions.
         Subtitles
     };
 
+    // Defines the default for 'passive' field used in the AddEventListenerOptions interface
+    // when javascript calls addEventListener.
+    enum class PassiveEventListenerDefault {
+        False, // Default of false.
+        True, // Default of true.
+        DocumentTrue, // Default of true for document level elements, false otherwise.
+        ForceAllTrue // Force all values to be true even when specified.
+    };
+
     // Sets value of a setting by its string identifier from Settings.in and
     // string representation of value. An enum's string representation is the
     // string representation of the integer value of the enum.
     virtual void setFromStrings(const WebString& name, const WebString& value) = 0;
 
     virtual bool mainFrameResizesAreOrientationChanges() const = 0;
     virtual bool shrinksViewportContentToFit() const = 0;
     virtual bool viewportEnabled() const = 0;
     virtual void setAccelerated2dCanvasEnabled(bool) = 0;
     virtual void setAccelerated2dCanvasMSAASampleCount(int) = 0;
@@ skipping 69 matching lines @@
     virtual void setMainFrameResizesAreOrientationChanges(bool) = 0;
     virtual void setMaxTouchPoints(int) = 0;
     virtual void setMediaControlsOverlayPlayButtonEnabled(bool) = 0;
     virtual void setMediaPlaybackRequiresUserGesture(bool) = 0;
     virtual void setPresentationRequiresUserGesture(bool) = 0;
     virtual void setMinimumAccelerated2dCanvasSize(int) = 0;
     virtual void setMinimumFontSize(int) = 0;
     virtual void setMinimumLogicalFontSize(int) = 0;
     virtual void setMockScrollbarsEnabled(bool) = 0;
     virtual void setOfflineWebApplicationCacheEnabled(bool) = 0;
+    virtual void setPassiveEventListenerDefault(PassiveEventListenerDefault) = 0;
     virtual void setPasswordEchoDurationInSeconds(double) = 0;
     virtual void setPasswordEchoEnabled(bool) = 0;
     virtual void setPerTilePaintingEnabled(bool) = 0;
     virtual void setPictographFontFamily(const WebString&, UScriptCode = USCRIPT_COMMON) = 0;
     virtual void setPinchOverlayScrollbarThickness(int) = 0;
     virtual void setPluginsEnabled(bool) = 0;
     virtual void setAvailablePointerTypes(int) = 0;
     virtual void setPrimaryPointerType(PointerType) = 0;
     virtual void setAvailableHoverTypes(int) = 0;
     virtual void setPrimaryHoverType(HoverType) = 0;
@@ skipping 66 matching lines @@
     virtual void setWideViewportQuirkEnabled(bool) = 0;
     virtual void setXSSAuditorEnabled(bool) = 0;
 
 protected:
     ~WebSettings() { }
 };
 
 } // namespace blink
 
 #endif