add HitTestCanvasResult Class instend of std::pair<Element*, String>

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 37 matching lines @@
 class CanvasImageSource;
 class Element;
 class ExceptionState;
 class FloatRect;
 class FloatSize;
 class Font;
 class FontMetrics;
 class HitRegion;
 class HitRegionOptions;
 class HitRegionManager;
+class HitTestCanvasResult;
 class Path2D;
 class SVGMatrixTearOff;
 class TextMetrics;
 
 typedef HTMLImageElementOrHTMLVideoElementOrHTMLCanvasElementOrImageBitmap CanvasImageSourceUnion;
 
 class MODULES_EXPORT CanvasRenderingContext2D final : public CanvasRenderingContext, public BaseRenderingContext2D, public WebThread::TaskObserver, public SVGResourceClient {
     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(CanvasRenderingContext2D);
     USING_PRE_FINALIZER(CanvasRenderingContext2D, dispose);
@@ skipping 59 matching lines @@
     void loseContext(LostContextMode) override;
     void didSetSurfaceSize() override;
 
     void restoreCanvasMatrixClipStack(SkCanvas*) const override;
 
     // TaskObserver implementation
     void didProcessTask() override;
     void willProcessTask() override { }
 
     void styleDidChange(const ComputedStyle* oldStyle, const ComputedStyle& newStyle) override;
-    std::pair<Element*, String> getControlAndIdIfHitRegionExists(const LayoutPoint& location) override;
+    HitTestCanvasResult* getControlAndIdIfHitRegionExists(const LayoutPoint& location) override;
     String getIdFromControl(const Element*) override;
 
     // SVGResourceClient implementation
     void filterNeedsInvalidation() override;
 
     // BaseRenderingContext2D implementation
     bool originClean() const final;
     void setOriginTainted() final;
     bool wouldTaintOrigin(CanvasImageSource* source, ExecutionContext*) final { return CanvasRenderingContext::wouldTaintOrigin(source); }
 
@@ skipping 77 matching lines @@
     bool m_pruneLocalFontCacheScheduled;
     ListHashSet<String> m_fontLRUList;
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context,
     context->is2d() && context->canvas(), context.is2d() && context.canvas());
 
 } // namespace blink
 
 #endif // CanvasRenderingContext2D_h