Update the stringifier behavior for DOMMatrixReadOnly

third_party/WebKit/Source/core/geometry/DOMMatrixReadOnly.cpp

Index: third_party/WebKit/Source/core/geometry/DOMMatrixReadOnly.cpp
diff --git a/third_party/WebKit/Source/core/geometry/DOMMatrixReadOnly.cpp b/third_party/WebKit/Source/core/geometry/DOMMatrixReadOnly.cpp
index fd09781ae4727015e83006bf86f86971163d5b6c..e179448cacafaf3ce33e9224b093b6a410df2f2b 100644
--- a/third_party/WebKit/Source/core/geometry/DOMMatrixReadOnly.cpp
+++ b/third_party/WebKit/Source/core/geometry/DOMMatrixReadOnly.cpp
@@ -304,20 +304,57 @@ NotShared<DOMFloat64Array> DOMMatrixReadOnly::toFloat64Array() const {
 }
 
 const String DOMMatrixReadOnly::toString() const {
-  std::stringstream stream;
+  String result;
   if (is2D()) {
-    stream << "matrix(" << a() << ", " << b() << ", " << c() << ", " << d()

[zino, 2017/05/09 09:32:04]

Looks good to me.

BTW, don't we use stringstream like previous patch?

stream << "matrix(" <<String::NumberToStringECMAScript(a()) << ", "
...

-           << ", " << e() << ", " << f();
+    result.append("matrix(");
+    result.append(String::NumberToStringECMAScript(a()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(b()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(c()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(d()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(e()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(f()));
   } else {
-    stream << "matrix3d(" << m11() << ", " << m12() << ", " << m13() << ", "
-           << m14() << ", " << m21() << ", " << m22() << ", " << m23() << ", "
-           << m24() << ", " << m31() << ", " << m32() << ", " << m33() << ", "
-           << m34() << ", " << m41() << ", " << m42() << ", " << m43() << ", "
-           << m44();
+    result.append("matrix3d(");
+    result.append(String::NumberToStringECMAScript(m11()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m12()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m13()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m14()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m21()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m22()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m23()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m24()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m31()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m32()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m33()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m34()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m41()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m42()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m43()));
+    result.append(", ");
+    result.append(String::NumberToStringECMAScript(m44()));
   }
-  stream << ")";
+  result.append(")");
 
-  return String(stream.str().c_str());
+  return result;
 }
 
 ScriptValue DOMMatrixReadOnly::toJSONForBinding(