TransformOperations should be able to blend outside the range [0, 1]

ui/gfx/transform.cc

Index: ui/gfx/transform.cc
diff --git a/ui/gfx/transform.cc b/ui/gfx/transform.cc
index 5e8799841fc4508782958a3aa716e3c5fe30630e..09a213ebbf05ae9b8b2210aab4988f7addc05af8 100644
--- a/ui/gfx/transform.cc
+++ b/ui/gfx/transform.cc
@@ -365,14 +365,6 @@ bool Transform::TransformRectReverse(RectF* rect) const {
 }
 
 bool Transform::Blend(const Transform& from, double progress) {
-  if (progress <= 0.0) {
-    *this = from;
-    return true;
-  }
-
-  if (progress >= 1.0)
-    return true;
-

[ajuma, 2013/06/01 14:54:12]

Please add a gfx::Transform unit test for this that uses a value of progress not
in [0, 1]. (This is already indirectly tested by the TransformOperation unit
tests you added, but I think we should also directly test this.)

   DecomposedTransform to_decomp;
   DecomposedTransform from_decomp;
   if (!DecomposeTransform(&to_decomp, *this) ||