Fix percent height calc for svg docs.

third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp b/third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp
index 243c005923e330871677136d17fa7ee572c2b617..05d0c153eeb67d51005b22857d1c39d64473ab8c 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp
@@ -26,6 +26,7 @@
 #include "core/frame/LocalFrame.h"
 #include "core/layout/HitTestResult.h"
 #include "core/layout/LayoutAnalyzer.h"
+#include "core/layout/LayoutView.h"
 #include "core/layout/api/LayoutPartItem.h"
 #include "core/layout/svg/LayoutSVGText.h"
 #include "core/layout/svg/SVGLayoutSupport.h"
@@ -134,6 +135,13 @@ LayoutUnit LayoutSVGRoot::ComputeReplacedLogicalHeight(
     return ContainingBlock()->AvailableLogicalHeight(
         kIncludeMarginBorderPadding);
 
+  const Length& logical_height = Style()->LogicalHeight();
+  if (IsDocumentElement() && logical_height.IsPercentOrCalc()) {
+    return ValueForLength(
+        logical_height,
+        GetDocument().GetLayoutView()->ViewLogicalHeightForPercentages());
+  }
+
   return LayoutReplaced::ComputeReplacedLogicalHeight(estimated_used_width);
 }