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..557f5f6e50386bdb15937d0383de7b2b91697b3d 100644
--- a/ui/compositor/test/test_utils.cc
+++ b/ui/compositor/test/test_utils.cc
@@ -10,13 +10,22 @@
 
 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) {
   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 <<")";
     }
   }
+
+  if (::testing::Test::HasFailure()) {

[danakj, 2013/08/29 21:22:34]

I'm not sure about this, if another test had a failure adn then later called
this function it'd get additional spam for no reason, right?

Maybe keep a local bool here to decide to print this or not?

[avallee, 2013/08/30 00:01:46]

Yeah, I'm not sure about this either. What I actually want to do is use the
float equals code provided to EXPECT_FLOAT_EQ, but that class is inside
::testing::internal, so I can't rely on that.

[danakj, 2013/08/30 00:04:09]

Oh I see. I guess that's why I used side effects in the << string part, same
reason.

You could print the number of errors and increment in the << above, and use that
here.

[avallee, 2013/09/04 15:04:41]

Done.

+    ADD_FAILURE() << "Expected matrix:\n"
+                  << lhs.ToString() << "\n"
+                  << "Actual matrix:\n"
+                  << rhs.ToString();
+  }
 }
 
 void CheckApproximatelyEqual(const gfx::Rect& lhs, const gfx::Rect& rhs) {