fix for valgrind uninit variables

src/gpu/GrDrawState.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawState.h"
 
 #include "GrBlend.h"
@@ skipping 99 matching lines @@
         fViewMatrix = *initialViewMatrix;
     }
     fFlagBits = 0x0;
     fStencilSettings.setDisabled();
     fDrawFace = kBoth_DrawFace;
 
     fHints = 0;
 
     fColorProcInfoValid = false;
     fCoverageProcInfoValid = false;
+
+    fColorCache = GrColor_ILLEGAL;
+    fCoverageCache = GrColor_ILLEGAL;
 }
 
 bool GrDrawState::setIdentityViewMatrix()  {
     if (this->numFragmentStages()) {
         SkMatrix invVM;
         if (!fViewMatrix.invert(&invVM)) {
             // sad trombone sound
             return false;
         }
         for (int s = 0; s < this->numColorStages(); ++s) {
@@ skipping 285 matching lines @@
             coverage = 0;
         } else {
             flags = kRGBA_GrColorComponentFlags;
         }
         fCoverageProcInfo.calcWithInitialValues(fCoverageStages.begin(), this->numCoverageStages(),
                                                 coverage, flags, true, fGeometryProcessor.get());
         fCoverageProcInfoValid = true;
         fCoverageCache = coverage;
     }
 }