Let clients of FilterEffectBuilder compute/provide the reference-box

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp

Index: third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp
index 6f4510143870f12d7f21f5420e52da495677b4ed..f69c0a7f7996765475e141ec7bf88899a148e666 100644
--- a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp
@@ -318,9 +318,9 @@ SkImageFilter* CanvasRenderingContext2DState::getFilter(Element* styleResolution
         m_strokeStyle->applyToPaint(strokePaintForFilter);
         fillPaintForFilter.setColor(m_fillStyle->paintColor());
         strokePaintForFilter.setColor(m_strokeStyle->paintColor());
-        FloatSize floatCanvasSize(canvasSize);
+        FloatRect referenceBox((FloatPoint()), FloatSize(canvasSize));
         const double effectiveZoom = 1.0; // Deliberately ignore zoom on the canvas element
-        filterEffectBuilder->build(styleResolutionHost, filterStyle->filter(), effectiveZoom, &floatCanvasSize, &fillPaintForFilter, &strokePaintForFilter);
+        filterEffectBuilder->build(styleResolutionHost, filterStyle->filter(), effectiveZoom, referenceBox, &fillPaintForFilter, &strokePaintForFilter);
 
         if (FilterEffect* lastEffect = filterEffectBuilder->lastEffect()) {
             m_resolvedFilter = SkiaImageFilterBuilder::build(lastEffect, ColorSpaceDeviceRGB);