Transform animations should not collapse by default when interpolating

cc/test/geometry_test_utils.h

 // Copyright 2011 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.
 
 #ifndef CC_TEST_GEOMETRY_TEST_UTILS_H_
 #define CC_TEST_GEOMETRY_TEST_UTILS_H_
 
+#include "cc/cc_export.h"
+
 namespace gfx {
 class Transform;
 }
 
 namespace cc {
 
 // These are macros instead of functions so that we get useful line numbers
 // where a test failed.
 #define EXPECT_FLOAT_RECT_EQ(expected, actual)               \
   do {                                                       \
@@ skipping 71 matching lines @@
 // and http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54337
 void ExpectTransformationMatrixEq(const gfx::Transform& expected,
                                   const gfx::Transform& actual);
 
 #define EXPECT_TRANSFORMATION_MATRIX_EQ(expected, actual) \
   do {                                                    \
     SCOPED_TRACE("");                                     \
     ExpectTransformationMatrixEq(expected, actual);       \
   } while (false)
 
+void ExpectTransformationMatrixNear(const gfx::Transform& expected,
+                                    const gfx::Transform& actual,
+                                    float abs_error);
+
+#define EXPECT_TRANSFORMATION_MATRIX_NEAR(expected, actual, abs_error) \
+  do {                                                                 \
+    SCOPED_TRACE("");                                                  \
+    ExpectTransformationMatrixNear(expected, actual, abs_error);       \
+  } while (false)
+
 // Should be used in test code only, for convenience. Production code should use
 // the gfx::Transform::GetInverse() API.
 gfx::Transform Inverse(const gfx::Transform& transform);
 
 }  // namespace cc
 
 #endif  // CC_TEST_GEOMETRY_TEST_UTILS_H_