Please Valgrind by calling preConcat.

src/gpu/gl/GrGLProgram.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLProgram_DEFINED
 #define GrGLProgram_DEFINED
@@ skipping 96 matching lines @@
             SkMatrix combined;
             if (kBottomLeft_GrSurfaceOrigin == fRenderTargetOrigin) {
                 combined.setAll(SkIntToScalar(2) / fRenderTargetSize.fWidth, 0, -SK_Scalar1,
                                 0, -SkIntToScalar(2) / fRenderTargetSize.fHeight, SK_Scalar1,
                                 0, 0, SkMatrix::I()[8]);
             } else {
                 combined.setAll(SkIntToScalar(2) / fRenderTargetSize.fWidth, 0, -SK_Scalar1,
                                 0, SkIntToScalar(2) / fRenderTargetSize.fHeight, -SK_Scalar1,
                                 0, 0, SkMatrix::I()[8]);
             }
-            combined.setConcat(combined, fViewMatrix);
+            combined.preConcat(fViewMatrix);
             GrGLGetMatrix<Size>(destMatrix, combined);
         }
     };
 
     /**
      * This function uploads uniforms and calls each GrGLEffect's setData. It is called before a
      * draw occurs using the program after the program has already been bound. It also uses the
      * GrGpuGL object to bind the textures required by the GrGLEffects. The color and coverage
      * stages come from GrGLProgramDesc::Build().
      */
@@ skipping 69 matching lines @@
     GrGLUniformManager                fUniformManager;
     UniformHandles                    fUniformHandles;
 
     bool                              fHasVertexShader;
     int                               fNumTexCoordSets;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif