Add platform/transforms pretty printers for logging and testing

third_party/WebKit/Source/platform/transforms/AffineTransformTest.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "platform/transforms/AffineTransform.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+TEST(AffineTransformTest, ToString)
+{
+    AffineTransform identity;
+    EXPECT_EQ("identity", identity.toString());
+    EXPECT_EQ("[1,0,0,\n0,1,0]", identity.toString(true));
+
+    AffineTransform translation = AffineTransform::translation(7, 9);
+    EXPECT_EQ("translation(7,9)", translation.toString());
+    EXPECT_EQ("[1,0,7,\n0,1,9]", translation.toString(true));
+
+    AffineTransform rotation;
+    rotation.rotate(180);
+    EXPECT_EQ("translation(0,0), scale(1,1), angle(180deg), remainder(1,0,0,1)", rotation.toString());
+    EXPECT_EQ("[-1,-1.22465e-16,0,\n1.22465e-16,-1,0]", rotation.toString(true));
+
+    AffineTransform columnMajorConstructor(1, 4, 2, 5, 3, 6);
+    EXPECT_EQ("[1,2,3,\n4,5,6]", columnMajorConstructor.toString(true));
+}
+
+} // namespace blink