cc: Don't DCHECK for layers with non-invertible transforms.

cc/resources/picture_layer_tiling_unittest.cc

Index: cc/resources/picture_layer_tiling_unittest.cc
diff --git a/cc/resources/picture_layer_tiling_unittest.cc b/cc/resources/picture_layer_tiling_unittest.cc
index 91043e67b48006e13d72f42781c97fd55828fcdb..544cac8ad2a6eb9120757af19185c19ba361cd45 100644
--- a/cc/resources/picture_layer_tiling_unittest.cc
+++ b/cc/resources/picture_layer_tiling_unittest.cc
@@ -358,5 +358,16 @@ TEST(PictureLayerTilingTest, ExpandRectOutOfBounds) {
   EXPECT_TRUE(out.IsEmpty());
 }
 
+TEST(PictureLayerTilingTest, EmptyStartingRect) {

[enne (OOO), 2013/04/09 02:08:38]

WTB unit test that makes sure this layer also has visible resources ready.

[danakj, 2013/04/09 02:42:17]

OK will do!

+  // If a layer has a non-invertible transform, then the starting rect
+  // for the layer would be empty.
+  gfx::Rect in(40, 40, 0, 0);
+  gfx::Rect bounds(0, 0, 10, 10);
+  int64 target_area = 400 * 400;
+  gfx::Rect out = PictureLayerTiling::ExpandRectEquallyToAreaBoundedBy(
+      in, target_area, bounds);
+  EXPECT_TRUE(out.IsEmpty());
+}
+
 }  // namespace
 }  // namespace cc