Don't use NULL GrOptDrawState to indicate that draw should be skipped.

src/gpu/GrInOrderDrawBuffer.cpp

Index: src/gpu/GrInOrderDrawBuffer.cpp
diff --git a/src/gpu/GrInOrderDrawBuffer.cpp b/src/gpu/GrInOrderDrawBuffer.cpp
index e5d67952147866cfe221b3cfb4ca20263daa7ac5..d61a15ff50efe6d9dea9449216bda42711e22f18 100644
--- a/src/gpu/GrInOrderDrawBuffer.cpp
+++ b/src/gpu/GrInOrderDrawBuffer.cpp
@@ -733,9 +733,9 @@ bool GrInOrderDrawBuffer::recordStateAndShouldDraw(const GrDrawState& ds,
                                                    GrGpu::DrawType drawType,
                                                    const GrClipMaskManager::ScissorState& scissor,
                                                    const GrDeviceCoordTexture* dstCopy) {
-    SkAutoTUnref<GrOptDrawState> optState(GrOptDrawState::Create(ds, fDstGpu, scissor, dstCopy,
-                                                                 drawType));
-    if (!optState) {
+    SkAutoTUnref<GrOptDrawState> optState(
+        SkNEW_ARGS(GrOptDrawState, (ds, fDstGpu, scissor, dstCopy, drawType)));
+    if (optState->mustSkip()) {
         return false;
     }
     if (!fLastState || *optState != *fLastState) {