Add a basic support of text-align:right property to NGInlineLayoutAlgorithm.

third_party/WebKit/Source/core/layout/ng/inline/ng_line_box_fragment_builder.cc

Index: third_party/WebKit/Source/core/layout/ng/inline/ng_line_box_fragment_builder.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/inline/ng_line_box_fragment_builder.cc b/third_party/WebKit/Source/core/layout/ng/inline/ng_line_box_fragment_builder.cc
index e972c2c052494d9204933f81ce05ad7b9c17798f..1a5562af410a08b7590f2bd502cb6c996813827a 100644
--- a/third_party/WebKit/Source/core/layout/ng/inline/ng_line_box_fragment_builder.cc
+++ b/third_party/WebKit/Source/core/layout/ng/inline/ng_line_box_fragment_builder.cc
@@ -42,6 +42,20 @@ void NGLineBoxFragmentBuilder::MoveChildrenInBlockDirection(LayoutUnit delta) {
     offset.block_offset += delta;
 }
 
+void NGLineBoxFragmentBuilder::MoveChildrenInInlineDirection(
+    LayoutUnit available_inline_size) {
+  NGWritingMode writing_mode(
+      FromPlatformWritingMode(node_->Style().GetWritingMode()));
+  LayoutUnit base_inline_offset = available_inline_size - inline_size_;

[kojii, 2017/05/22 03:27:03]

Can't we add delta instead? The position may not be the sum of sizes.

Were there cases where doing so doesn't work well? If so, can you leave
comments, because I'll need to change this to adding delta sometime soon to
support inline margins.

+  LayoutUnit child_inline_size;
+  for (size_t i = 0; i < children_.size(); ++i) {
+    offsets_[i].inline_offset = base_inline_offset + child_inline_size;
+    NGPhysicalFragment* child = children_[i].Get();
+    child_inline_size +=
+        child->Size().ConvertToLogical(writing_mode).inline_size;
+  }
+}
+
 void NGLineBoxFragmentBuilder::MoveChildrenInBlockDirection(LayoutUnit delta,
                                                             unsigned start,
                                                             unsigned end) {