Add left_offset to NGFloatingObject and set it on legacy FloatingObject

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 860ab627a9cefe573133a37fbb2ee7d0ca81d2d5..e971d0595967bcbfcb2865a6feceafe9641ad257 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -489,8 +489,8 @@ crbug.com/635619 virtual/layout_ng/fast/block/basic/truncation-rtl.html [ Skip ]
 crbug.com/635619 virtual/layout_ng/fast/block/basic/white-space-pre-wraps.html [ Skip ]
 
 #### fast/block/margin-collapse
-#### Passed: 8
-#### Skipped: 82
+#### Passed: 7
+#### Skipped: 81
 crbug.com/635619 virtual/layout_ng/fast/block/margin-collapse/001.html [ Skip ]
 crbug.com/635619 virtual/layout_ng/fast/block/margin-collapse/002.html [ Skip ]
 crbug.com/635619 virtual/layout_ng/fast/block/margin-collapse/003.html [ Skip ]
@@ -573,6 +573,7 @@ crbug.com/635619 virtual/layout_ng/fast/block/margin-collapse/self-collapsing-co
 crbug.com/635619 virtual/layout_ng/fast/block/margin-collapse/table-beside-float-complex-margin-collapsing.html [ Skip ]
 crbug.com/635619 virtual/layout_ng/fast/block/margin-collapse/webkit-margin-collapse-container.html [ Skip ]
 crbug.com/635619 virtual/layout_ng/fast/block/margin-collapse/webkit-margin-collapse-separate-position.html [ Skip ]
+crbug.com/635619 virtual/layout_ng/fast/block/float/float-change-composited-scrolling.html [ Skip ]
 
 #### fast/block/float
 #### Passed: 56