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..9afc99705b97924e0e9df7d2d3624a3e409d9226 100644
--- a/third_party/WebKit/Source/platform/LayoutUnit.h
+++ b/third_party/WebKit/Source/platform/LayoutUnit.h
@@ -35,6 +35,7 @@
 #include "wtf/Assertions.h"
 #include "wtf/MathExtras.h"
 #include "wtf/SaturatedArithmetic.h"
+#include "wtf/text/WTFString.h"
 #include <algorithm>
 #include <limits.h>
 #include <limits>
@@ -212,6 +213,19 @@ public:
         return clampTo<LayoutUnit>(value, LayoutUnit::min(), LayoutUnit::max());
     }
 
+    String toString() const
+    {
+        if (m_value == LayoutUnit::max().rawValue())

[esprehn, 2016/08/19 17:58:52]

can we make this out of line?

+            return String::format("LayoutUnit::max(%f)", toDouble());

[esprehn, 2016/08/19 17:58:53]

fwiw this is slow, doing "LayoutUnit::max(" + String::number(toDouble()) + ")"
avoids the extra allocations and copies. This code isn't very performance
sensitive though so this is fine :)

+        if (m_value == LayoutUnit::min().rawValue())
+            return String::format("LayoutUnit::min(%f)", toDouble());
+        if (m_value == LayoutUnit::nearlyMax().rawValue())
+            return String::format("LayoutUnit::nearlyMax(%f)", toDouble());
+        if (m_value == LayoutUnit::nearlyMin().rawValue())
+            return String::format("LayoutUnit::nearlyMin(%f)", toDouble());
+        return String::number(toDouble());
+    }
+
 private:
     static bool isInBounds(int value)
     {
@@ -808,7 +822,7 @@ inline LayoutUnit clampToLayoutUnit(LayoutUnit value, LayoutUnit min, LayoutUnit
 
 inline std::ostream& operator<<(std::ostream& stream, const LayoutUnit& value)
 {
-    return stream << value.toDouble();
+    return stream << value.toString();
 }
 
 } // namespace blink