Use the baseline information exposed by C++ to pipe baseline data through RenderBox.

sky/engine/core/rendering/RenderParagraph.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sky/engine/core/rendering/RenderParagraph.h"
 
 #include "sky/engine/core/rendering/BidiRunForLine.h"
 #include "sky/engine/core/rendering/InlineIterator.h"
 #include "sky/engine/core/rendering/RenderLayer.h"
 #include "sky/engine/core/rendering/RenderObjectInlines.h"
@@ skipping 1338 matching lines @@
 
     if (styleToUse->collapseWhiteSpace())
         stripTrailingSpace(inlineMax, inlineMin, trailingSpaceChild);
 
     updatePreferredWidth(minLogicalWidth, inlineMin);
     updatePreferredWidth(maxLogicalWidth, inlineMax);
 
     maxLogicalWidth = std::max(minLogicalWidth, maxLogicalWidth);
 }
 
-int RenderParagraph::firstLineBoxBaseline() const
+int RenderParagraph::firstLineBoxBaseline(FontBaselineOrAuto baselineType) const
 {
-    return firstLineBox() ? firstLineBox()->logicalTop() + style(true)->fontMetrics().ascent(firstRootBox()->baselineType()) : -1;
+  if (!firstLineBox())
+    return -1;
+  FontBaseline baseline;
+  if (baselineType.m_auto)
+    baseline = firstRootBox()->baselineType();
+  else
+    baseline = baselineType.m_baseline;
+  return firstLineBox()->logicalTop() + style(true)->fontMetrics().ascent(baseline);
 }
 
 int RenderParagraph::lastLineBoxBaseline(LineDirectionMode lineDirection) const
 {
     if (!firstLineBox() && hasLineIfEmpty()) {
         const FontMetrics& fontMetrics = firstLineStyle()->fontMetrics();
         return fontMetrics.ascent()
              + (lineHeight(true, lineDirection, PositionOfInteriorLineBoxes) - fontMetrics.height()) / 2
              + (lineDirection == HorizontalLine ? borderTop() + paddingTop() : borderRight() + paddingRight());
     }
@@ skipping 322 matching lines @@
                     curr->adjustLogicalPosition(logicalLeft, 0);
                 else
                     curr->adjustLogicalPosition(logicalLeft - (availableLogicalWidth - totalLogicalWidth), 0);
             }
         }
         firstLine = false;
     }
 }
 
 } // namespace blink