Don't anti-alias clips in the Blink-replay path.

third_party/WebKit/Source/platform/graphics/paint/ClipDisplayItem.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/ClipDisplayItem.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/ClipDisplayItem.cpp b/third_party/WebKit/Source/platform/graphics/paint/ClipDisplayItem.cpp
index a1557a1517b61fb90d2b491b843bb066988b6f27..e4563be48b8147d6ea2893e8b8187e54dd41bb9d 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/ClipDisplayItem.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/ClipDisplayItem.cpp
@@ -14,7 +14,9 @@ namespace blink {
 void ClipDisplayItem::replay(GraphicsContext& context) const
 {
     context.save();
-    context.clipRect(m_clipRect, AntiAliased);
+    // TODO(chrishtr): make this AntiAliased. Not anti-aliasing here is a workaround for a PDF rendering issue.
+    // See crbug.com/590971.
+    context.clipRect(m_clipRect, NotAntiAliased);
 
     for (const FloatRoundedRect& roundedRect : m_roundedRectClips)
         context.clipRoundedRect(roundedRect);