Fix restore in AVMR to have correct coverage count.

src/gpu/GrDrawState.cpp

Index: src/gpu/GrDrawState.cpp
diff --git a/src/gpu/GrDrawState.cpp b/src/gpu/GrDrawState.cpp
index 5e177b8b128b2220d701bbf8ce068ce6dd2f9786..288fa12730850316750b1992446ee7381a860d83 100644
--- a/src/gpu/GrDrawState.cpp
+++ b/src/gpu/GrDrawState.cpp
@@ -515,6 +515,7 @@ void GrDrawState::AutoViewMatrixRestore::restore() {
         fDrawState->fViewMatrix = fViewMatrix;
         SkASSERT(fDrawState->numColorStages() >= fNumColorStages);
         int numCoverageStages = fSavedCoordChanges.count() - fNumColorStages;
+        numCoverageStages -= fHasGeometryProcessor ? 1 : 0;
         SkASSERT(fDrawState->numCoverageStages() >= numCoverageStages);
 
         int i = 0;