Add support for inverse transform animations.

ui/compositor/test/test_utils.cc

Index: ui/compositor/test/test_utils.cc
diff --git a/ui/compositor/test/test_utils.cc b/ui/compositor/test/test_utils.cc
index dc70b79159b556c5f341a6f2bfb2d3f192cd2ac8..145e0258a301212ed1cdf33bafbc6f994e3774fe 100644
--- a/ui/compositor/test/test_utils.cc
+++ b/ui/compositor/test/test_utils.cc
@@ -10,13 +10,23 @@
 
 namespace ui {
 
+//TODO(avallee): Make this into a predicate and add some matrix pretty printing.
 void CheckApproximatelyEqual(const gfx::Transform& lhs,
                              const gfx::Transform& rhs) {
+  unsigned int errors = 0;
   for (int i = 0; i < 4; ++i) {
     for (int j = 0; j < 4; ++j) {
-      EXPECT_FLOAT_EQ(lhs.matrix().get(i, j), rhs.matrix().get(i, j));
+      EXPECT_FLOAT_EQ(lhs.matrix().get(i, j), rhs.matrix().get(i, j))
+        << "(i, j) = (" << i << ", " << j << "), error count: " << ++errors;
     }
   }
+
+  if (errors) {
+    ADD_FAILURE() << "Expected matrix:\n"
+                  << lhs.ToString() << "\n"
+                  << "Actual matrix:\n"
+                  << rhs.ToString();
+  }
 }
 
 void CheckApproximatelyEqual(const gfx::Rect& lhs, const gfx::Rect& rhs) {