Adjust the rounding methodology for tiled background phase

third_party/WebKit/Source/core/paint/BackgroundImageGeometry.h

Index: third_party/WebKit/Source/core/paint/BackgroundImageGeometry.h
diff --git a/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.h b/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.h
index 8a63e2815df211ae573e41fea5d10cbc5d7fcefe..87de25ee3832cb7de859579f470ff630136285d0 100644
--- a/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.h
+++ b/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.h
@@ -29,8 +29,8 @@ public:
         const GlobalPaintFlags, const FillLayer&, const LayoutRect& paintRect);
 
     LayoutRect destRect() const { return m_destRect; }
-    LayoutSize tileSize() const { return m_tileSize; }
-    LayoutSize imageContainerSize() const { return m_imageContainerSize; }
+    LayoutSize tileSize() const { ASSERT(m_imageContainerSize == m_tileSize); return m_tileSize; }

[Stephen Chennney, 2016/03/11 17:39:01]

I'll remove these before landing, and remove the notion of imageContainerSize,
as it is redundant.

+    LayoutSize imageContainerSize() const { ASSERT(m_imageContainerSize == m_tileSize); return m_imageContainerSize; }
     LayoutPoint phase() const { return m_phase; }
     // Space-size represents extra width and height that may be added to
     // the image if used as a pattern with background-repeat: space.
@@ -49,10 +49,7 @@ private:
     void setNoRepeatX(LayoutUnit xOffset);
     void setNoRepeatY(LayoutUnit yOffset);
 
-    void pixelSnapGeometry();
-
     void useFixedAttachment(const LayoutPoint& attachmentPoint);
-    void clip(const LayoutRect&);
     void setHasNonLocalGeometry() { m_hasNonLocalGeometry = true; }
 
     LayoutRect m_destRect;