Modify GrClipMaskManager to reflect logical constness

src/gpu/GrPipelineBuilder.cpp

Index: src/gpu/GrPipelineBuilder.cpp
diff --git a/src/gpu/GrPipelineBuilder.cpp b/src/gpu/GrPipelineBuilder.cpp
index 5ef30e5947db44fdcb53102da98d306e2d144f5e..4c9b0a9ec49a2edc00371d89304090b07b404093 100644
--- a/src/gpu/GrPipelineBuilder.cpp
+++ b/src/gpu/GrPipelineBuilder.cpp
@@ -99,7 +99,8 @@ bool GrPipelineBuilder::willXPNeedDstTexture(const GrCaps& caps,
                                                     this->hasMixedSamples());
 }
 
-void GrPipelineBuilder::AutoRestoreFragmentProcessors::set(GrPipelineBuilder* pipelineBuilder) {
+void GrPipelineBuilder::AutoRestoreFragmentProcessors::set(
+                                                         const GrPipelineBuilder* pipelineBuilder) {
     if (fPipelineBuilder) {
         int m = fPipelineBuilder->numColorFragmentStages() - fColorEffectCnt;
         SkASSERT(m >= 0);
@@ -114,7 +115,7 @@ void GrPipelineBuilder::AutoRestoreFragmentProcessors::set(GrPipelineBuilder* pi
         }
         SkDEBUGCODE(--fPipelineBuilder->fBlockEffectRemovalCnt;)
     }
-    fPipelineBuilder = pipelineBuilder;
+    fPipelineBuilder = const_cast<GrPipelineBuilder*>(pipelineBuilder);
     if (NULL != pipelineBuilder) {
         fColorEffectCnt = pipelineBuilder->numColorFragmentStages();
         fCoverageEffectCnt = pipelineBuilder->numCoverageFragmentStages();