Fix Ruby visual rects in flipped blocks writing mode.

third_party/WebKit/Source/core/layout/LayoutInline.cpp

Index: third_party/WebKit/Source/core/layout/LayoutInline.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutInline.cpp b/third_party/WebKit/Source/core/layout/LayoutInline.cpp
index 71782d3e40ceebd5141612c58f2a19d3739b6da5..861d771327f6fb72e3e7a517362ef10a6db44fb1 100644
--- a/third_party/WebKit/Source/core/layout/LayoutInline.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutInline.cpp
@@ -1096,7 +1096,7 @@ bool LayoutInline::mapToVisualRectInAncestorSpace(const LayoutBoxModelObject* an
     if (containerBox && !containerBox->mapScrollingContentsRectToBoxSpace(rect, container == ancestor ? ApplyNonScrollOverflowClip : ApplyOverflowClip, visualRectFlags))
         return false;
 
-    if (containerBox)
+    if (containerBox && !isRuby())

[wkorman, 2016/07/20 22:14:52]

This was needed to avoid losing the topLeft location of the rect being mapped
when we move from LayoutRuby (inline) RUBY to the container. Logging snippet and
layout tree below:

[1:1:0720/132538:1038859601405:ERROR:LayoutInline.cpp(1073)] "LayoutRuby
(inline) RUBY", rect="20.000000,2.000000 12.000000x4.000000"
[1:1:0720/132538:1038859601598:ERROR:LayoutBox.cpp(2129)] obj="LayoutBlockFlow
DIV", container="LayoutBlockFlow BODY", container->isBox()=1,
containingBlock="LayoutBlockFlow BODY", origTopLeft="0.000000,2.000000",
topLeftLocation="0.000000,0.000000", inputRect="0.000000,2.000000
12.000000x4.000000", outputRect="0.000000,2.000000 12.000000x4.000000"

  LayoutBlockFlow {HTML} at (0,0) size 800x24
    LayoutBlockFlow {BODY} at (8,8) size 784x8
      LayoutBlockFlow {DIV} at (0,0) size 32x8
        LayoutRuby (inline) {RUBY} at (0,0) size 19x8
          LayoutRubyRun (anonymous) at (12,0) size 20x8
            LayoutRubyText {RT} at (-12,0) size 12x8
              LayoutText {#text} at (0,2) size 12x4
                text run at (0,2) width 4: "c"
            LayoutRubyBase (anonymous) at (0,0) size 20x8
              LayoutText {#text} at (0,0) size 19x8
                text run at (0,0) width 8: "b"
        LayoutText {#text} at (0,0) size 0x0

         containerBox->flipForWritingMode(rect);
     return container->mapToVisualRectInAncestorSpace(ancestor, rect, visualRectFlags);
 }