Add Double{Size, Point, Rect} pretty printers for logging and testing

third_party/WebKit/Source/platform/geometry/DoublePoint.h

Index: third_party/WebKit/Source/platform/geometry/DoublePoint.h
diff --git a/third_party/WebKit/Source/platform/geometry/DoublePoint.h b/third_party/WebKit/Source/platform/geometry/DoublePoint.h
index 5484ad95a2b47897ad796d81403dbbbf3d81b37b..b2a6e9c7cc8720844f8df97da203198e557bc98f 100644
--- a/third_party/WebKit/Source/platform/geometry/DoublePoint.h
+++ b/third_party/WebKit/Source/platform/geometry/DoublePoint.h
@@ -99,9 +99,7 @@ public:
         return DoublePoint(m_x * scale, m_y * scale);
     }
 
-#ifndef NDEBUG
     String toString() const;
-#endif
 
 private:
     double m_x, m_y;
@@ -176,6 +174,10 @@ inline DoubleSize toDoubleSize(const DoublePoint& a)
     return DoubleSize(a.x(), a.y());
 }
 
+// Redeclared here to avoid ODR issues.
+// See platform/testing/GeometryPrinters.h.
+void PrintTo(const DoublePoint&, std::ostream*);
+
 } // namespace blink
 
 #endif