Add support for inverse transform animations.

ui/compositor/test/test_utils.cc

 // Copyright (c) 2012 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 "ui/compositor/test/test_utils.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/transform.h"
 
 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) {
   EXPECT_FLOAT_EQ(lhs.x(), rhs.x());
   EXPECT_FLOAT_EQ(lhs.y(), rhs.y());
   EXPECT_FLOAT_EQ(lhs.width(), rhs.width());
   EXPECT_FLOAT_EQ(lhs.height(), rhs.height());
 }
 
 }  // namespace ui