Treat <table> widths of 0 as auto.

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

Index: third_party/WebKit/Source/core/layout/TableLayoutAlgorithmAuto.cpp
diff --git a/third_party/WebKit/Source/core/layout/TableLayoutAlgorithmAuto.cpp b/third_party/WebKit/Source/core/layout/TableLayoutAlgorithmAuto.cpp
index 60b753b6118edc888be4cf82274c34f1ea90b36c..b5b8528a0df32f86342fa85e7f23272559e6fb26 100644
--- a/third_party/WebKit/Source/core/layout/TableLayoutAlgorithmAuto.cpp
+++ b/third_party/WebKit/Source/core/layout/TableLayoutAlgorithmAuto.cpp
@@ -195,7 +195,8 @@ static bool shouldScaleColumns(LayoutTable* table)
             if (cb && cb->isTableCell()
                 && (cb->style()->width().isAuto() || cb->style()->width().hasPercent())) {
                 LayoutTableCell* cell = toLayoutTableCell(cb);
-                if (cell->colSpan() > 1 || cell->table()->style()->width().isAuto())
+                Length tableWidth = cell->table()->style()->width();
+                if (cell->colSpan() > 1 || tableWidth.isAuto() || (tableWidth.isSpecified() && tableWidth.isZero()))

[mstensho (USE GERRIT), 2016/02/10 10:04:09]

I think this is the behavior we want.

The reason why <table style="width:0;"> is treated as auto on a general basis
can be found in LayoutTable::updateLogicalWidth():

    if ((styleLogicalWidth.isSpecified() && styleLogicalWidth.isPositive()) ||
styleLogicalWidth.isIntrinsic()) {

So maybe we could add this as a method to LayoutTable?

bool LayoutTable::isLogicalWidthAuto() { ... return
(!styleLogicalWidth.isSpecified() || !styleLogicalWidth.isPositive()) &&
!styleLogicalWidth.isIntrinsic(); }

[dgrogan, 2016/02/10 18:38:26]

Done.

                     scale = false;
                 else
                     table = cell->table();