fix for uniform view matrix being uploaded but not used

src/gpu/gl/GrGLPrimitiveProcessor.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLPrimitiveProcessor.h"
 
 #include "builders/GrGLProgramBuilder.h"
@@ skipping 46 matching lines @@
 
 void GrGLPrimitiveProcessor::addUniformViewMatrix(GrGLGPBuilder* pb) {
     fViewMatrixUniform = pb->addUniform(GrGLProgramBuilder::kVertex_Visibility,
                                         kMat33f_GrSLType, kDefault_GrSLPrecision,
                                         "uViewM",
                                         &fViewMatrixName);
 }
 
 void GrGLPrimitiveProcessor::setUniformViewMatrix(const GrGLProgramDataManager& pdman,
                                                   const SkMatrix& viewMatrix) {
-    if (!fViewMatrix.cheapEqualTo(viewMatrix)) {
+    if (!viewMatrix.isIdentity() && !fViewMatrix.cheapEqualTo(viewMatrix)) {
         SkASSERT(fViewMatrixUniform.isValid());
         fViewMatrix = viewMatrix;
 
         GrGLfloat viewMatrix[3 * 3];
         GrGLGetMatrix<3>(viewMatrix, fViewMatrix);
         pdman.setMatrix3f(fViewMatrixUniform, viewMatrix);
     }
 }