Apply SVG viewport clips in PaintLayer; paint background of replaced like boxes.

third_party/WebKit/LayoutTests/TestExpectations

Index: third_party/WebKit/LayoutTests/TestExpectations
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index da8d276d7b7dd669147609aa2d9a8e09e6d73b61..8f609d547e6a46a6f432f85fc9c66c236af9c5c4 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -1151,6 +1151,11 @@ crbug.com/528062 [ Win ] virtual/mojo-loading/http/tests/security/contentSecurit
 crbug.com/528062 [ Win ] virtual/mojo-loading/http/tests/security/xssAuditor/cached-frame.html [ Failure ]
 crbug.com/528062 [ Win ] virtual/mojo-loading/http/tests/security/xssAuditor/chunked-big-script.html [ Failure ]
 
+crbug.com/680325 svg/custom/mouse-move-on-svg-container-standalone.svg [ NeedsRebaseline ]
+crbug.com/680325 svg/custom/mouse-move-on-svg-root-standalone.svg [ NeedsRebaseline ]
+crbug.com/680325 svg/custom/pattern-userSpaceOnUse-userToBaseTransform.xhtml [ NeedsRebaseline ]
+crbug.com/680325 svg/custom/viewport-update2.svg [ NeedsRebaseline ]
+
 crbug.com/392706 virtual/threaded/animations/play-state-initially-paused.html [ Failure ]
 
 # Part of a larger issue referenced in the bug. This specific issue will be fixed shortly.