Migrate from MathUtil::inverse() to gfx::Transform::GetInverse()

cc/test/geometry_test_utils.cc

Index: cc/test/geometry_test_utils.cc
diff --git a/cc/test/geometry_test_utils.cc b/cc/test/geometry_test_utils.cc
index bed04c4bf0fbf298af668a4bdd35e44b35ce7f8e..385dbaca262aab9ceccf437516e6021f93754ae0 100644
--- a/cc/test/geometry_test_utils.cc
+++ b/cc/test/geometry_test_utils.cc
@@ -4,6 +4,7 @@
 
 #include "cc/test/geometry_test_utils.h"
 
+#include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebTransformationMatrix.h"
 #include "ui/gfx/transform.h"
@@ -56,4 +57,12 @@ void ExpectTransformationMatrixEq(const gfx::Transform& expected,
     EXPECT_FLOAT_EQ((expected).matrix().getDouble(3, 3), (actual).matrix().getDouble(3, 3));
 }
 
+gfx::Transform inverse(const gfx::Transform& transform)
+{
+    gfx::Transform result(gfx::Transform::kSkipInitialization);
+    bool invertedSuccessfully = transform.GetInverse(&result);
+    DCHECK(invertedSuccessfully);
+    return result;
+}
+
 }  // namespace cc