Initial change to create GeometryProcessor

BUG=skia:
R=bsalomon@google.com, robertphillips@google.com, egdaniel@google.com, jvanverth@google.com

Author: joshualitt@chromium.org

Review URL: https://codereview.chromium.org/509153002
diff --git a/src/gpu/GrAAHairLinePathRenderer.cpp b/src/gpu/GrAAHairLinePathRenderer.cpp
index 2114720..9986ac8 100644
--- a/src/gpu/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/GrAAHairLinePathRenderer.cpp
@@ -1002,7 +1002,7 @@
             SkASSERT(NULL != hairQuadEffect);
             GrDrawState::AutoRestoreEffects are(drawState);
             target->setIndexSourceToBuffer(fQuadsIndexBuffer);
-            drawState->addCoverageEffect(hairQuadEffect, kEdgeAttrIndex)->unref();
+            drawState->setGeometryProcessor(hairQuadEffect, kEdgeAttrIndex)->unref();
             int quads = 0;
             while (quads < quadCnt) {
                 int n = SkTMin(quadCnt - quads, kNumQuadsInIdxBuffer);
@@ -1021,7 +1021,7 @@
             GrEffect* hairConicEffect = GrConicEffect::Create(kHairlineAA_GrEffectEdgeType,
                                                               *target->caps());
             SkASSERT(NULL != hairConicEffect);
-            drawState->addCoverageEffect(hairConicEffect, 1, 2)->unref();
+            drawState->setGeometryProcessor(hairConicEffect, 1, 2)->unref();
             int conics = 0;
             while (conics < conicCnt) {
                 int n = SkTMin(conicCnt - conics, kNumQuadsInIdxBuffer);