Fix use-of-uninitialized-value in TransformationMatrix::blend()

Source/platform/transforms/TransformationMatrix.cpp

 /*
  * Copyright (C) 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2009 Torch Mobile, Inc.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 1346 matching lines @@
 }
 
 void TransformationMatrix::blend(const TransformationMatrix& from, double progress)
 {
     if (from.isIdentity() && isIdentity())
         return;
 
     // decompose
     DecomposedType fromDecomp;
     DecomposedType toDecomp;
-    from.decompose(fromDecomp);
-    decompose(toDecomp);
+    if (!from.decompose(fromDecomp) || !decompose(toDecomp)) {
+        if (progress < 0.5)
+            *this = from;
+        return;
+    }
 
     // interpolate
     blendFloat(fromDecomp.scaleX, toDecomp.scaleX, progress);
     blendFloat(fromDecomp.scaleY, toDecomp.scaleY, progress);
     blendFloat(fromDecomp.scaleZ, toDecomp.scaleZ, progress);
     blendFloat(fromDecomp.skewXY, toDecomp.skewXY, progress);
     blendFloat(fromDecomp.skewXZ, toDecomp.skewXZ, progress);
     blendFloat(fromDecomp.skewYZ, toDecomp.skewYZ, progress);
     blendFloat(fromDecomp.translateX, toDecomp.translateX, progress);
     blendFloat(fromDecomp.translateY, toDecomp.translateY, progress);
@@ skipping 167 matching lines @@
     ret.setDouble(2, 2, matrix.m33());
     ret.setDouble(2, 3, matrix.m43());
     ret.setDouble(3, 0, matrix.m14());
     ret.setDouble(3, 1, matrix.m24());
     ret.setDouble(3, 2, matrix.m34());
     ret.setDouble(3, 3, matrix.m44());
     return ret;
 }
 
 }