Revert of Remove GP from drawstate, revision of invariant output for GP (patchset #9 id:160001 of https://codereview.chromium.org/791743003/)

Reason for revert:
breaks mac

Original issue's description:
> Remove GP from drawstate, revision of invariant output for GP
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/c6bc58eded89b0c0a36b8e20e193c200f297a0da

TBR=bsalomon@google.com,egdaniel@google.com,joshualitt@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/794843002
diff --git a/src/gpu/GrDefaultPathRenderer.cpp b/src/gpu/GrDefaultPathRenderer.cpp
index 07f9208..24d3c45 100644
--- a/src/gpu/GrDefaultPathRenderer.cpp
+++ b/src/gpu/GrDefaultPathRenderer.cpp
@@ -498,13 +498,12 @@
                 drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
             }
             GrDrawState::AutoRestoreEffects are(drawState);
-            SkAutoTUnref<const GrGeometryProcessor> gp(
+            drawState->setGeometryProcessor(
                     GrDefaultGeoProcFactory::Create(color,
                                                     GrDefaultGeoProcFactory::kPosition_GPType,
-                                                    newCoverage));
+                                                    newCoverage))->unref();
             if (indexCnt) {
                 target->drawIndexed(drawState,
-                                    gp,
                                     primType,
                                     0,
                                     0,
@@ -512,7 +511,7 @@
                                     indexCnt,
                                     &devBounds);
             } else {
-                target->drawNonIndexed(drawState, gp, primType, 0, vertexCnt, &devBounds);
+                target->drawNonIndexed(drawState, primType, 0, vertexCnt, &devBounds);
             }
         }
     }