Add platform/geometry pretty printers for logging and testing

third_party/WebKit/Source/platform/LayoutUnit.h

Index: third_party/WebKit/Source/platform/LayoutUnit.h
diff --git a/third_party/WebKit/Source/platform/LayoutUnit.h b/third_party/WebKit/Source/platform/LayoutUnit.h
index 16677770cb0f7be5762cf5721fd9ef0027c4a294..f3ee505b5d867fcf8f963b4553a228f68f4c7b9c 100644
--- a/third_party/WebKit/Source/platform/LayoutUnit.h
+++ b/third_party/WebKit/Source/platform/LayoutUnit.h
@@ -808,6 +808,14 @@ inline LayoutUnit clampToLayoutUnit(LayoutUnit value, LayoutUnit min, LayoutUnit
 
 inline std::ostream& operator<<(std::ostream& stream, const LayoutUnit& value)
 {
+    if (value == LayoutUnit::max())
+        return stream << "LayoutUnit::max(" << value.toDouble() << ")";
+    if (value == LayoutUnit::min())
+        return stream << "LayoutUnit::min(" << value.toDouble() << ")";
+    if (value == LayoutUnit::nearlyMax())
+        return stream << "LayoutUnit::nearlyMax(" << value.toDouble() << ")";
+    if (value == LayoutUnit::nearlyMin())
+        return stream << "LayoutUnit::nearlyMin(" << value.toDouble() << ")";
     return stream << value.toDouble();
 }