Add platform/geometry pretty printers for logging and testing

third_party/WebKit/Source/platform/geometry/FloatSize.cpp

Index: third_party/WebKit/Source/platform/geometry/FloatSize.cpp
diff --git a/third_party/WebKit/Source/platform/geometry/FloatSize.cpp b/third_party/WebKit/Source/platform/geometry/FloatSize.cpp
index 38c3375fff957d4bcbb4be9aa07d068e022b27cf..fba58ad1e89f37c53ac1f460944f3097f25e8845 100644
--- a/third_party/WebKit/Source/platform/geometry/FloatSize.cpp
+++ b/third_party/WebKit/Source/platform/geometry/FloatSize.cpp
@@ -29,9 +29,9 @@
 #include "platform/FloatConversion.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/geometry/LayoutSize.h"
-#include "wtf/text/WTFString.h"
 #include <limits>
 #include <math.h>
+#include <ostream> // NOLINT
 
 namespace blink {
 
@@ -61,11 +61,12 @@ FloatSize FloatSize::narrowPrecision(double width, double height)
     return FloatSize(narrowPrecisionToFloat(width), narrowPrecisionToFloat(height));
 }
 
-#ifndef NDEBUG
-String FloatSize::toString() const
+std::ostream& operator<<(std::ostream& os, const FloatSize& size)
 {
-    return String::format("%fx%f", width(), height());
+    os << "FloatSize("
+        << "width=" << size.width() << ", "
+        << "height=" << size.height() << ")";
+    return os;
 }
-#endif
 
 } // namespace blink