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

ui/gfx/transform.cc

Index: ui/gfx/transform.cc
diff --git a/ui/gfx/transform.cc b/ui/gfx/transform.cc
index a4a4e64bb7497a0f84d7b7a50a1eb490671a7c4f..c2b6ba2fa9dffe86b6d2e7795ea3096f1479161f 100644
--- a/ui/gfx/transform.cc
+++ b/ui/gfx/transform.cc
@@ -245,7 +245,14 @@ bool Transform::IsBackFaceVisible() const {
 }
 
 bool Transform::GetInverse(Transform* transform) const {
-  return matrix_.invert(&transform->matrix_);
+  if (!matrix_.invert(&transform->matrix_)) {
+    // Initialize the return value to identity if this matrix turned
+    // out to be un-invertible.
+    transform->MakeIdentity();
+    return false;
+  }
+
+  return true;
 }
 
 void Transform::Transpose() {