Convert GrClip to an abstract base class

src/effects/SkLightingImageFilter.cpp

Index: src/effects/SkLightingImageFilter.cpp
diff --git a/src/effects/SkLightingImageFilter.cpp b/src/effects/SkLightingImageFilter.cpp
index d9b29363ed5a692dd2494b6e8a1902b5fe0551c3..d920c0eb798690df34c5d79adb49a135e7f6df44 100644
--- a/src/effects/SkLightingImageFilter.cpp
+++ b/src/effects/SkLightingImageFilter.cpp
@@ -415,18 +415,17 @@ sk_sp<SkSpecialImage> SkLightingImageFilterInternal::filterImageGPU(SkSpecialIma
         return nullptr;
     }
 
-    SkRect dstRect = SkRect::MakeWH(SkIntToScalar(offsetBounds.width()),
-                                    SkIntToScalar(offsetBounds.height()));
+    const SkIRect& dstRect = SkIRect::MakeWH(offsetBounds.width(), offsetBounds.height());
 
     // setup new clip
-    GrClip clip(dstRect);
+    GrFixedClip clip(dstRect);
 
     const SkIRect inputBounds = SkIRect::MakeWH(input->width(), input->height());
     SkRect topLeft = SkRect::MakeXYWH(0, 0, 1, 1);
     SkRect top = SkRect::MakeXYWH(1, 0, dstRect.width() - 2, 1);
     SkRect topRight = SkRect::MakeXYWH(dstRect.width() - 1, 0, 1, 1);
     SkRect left = SkRect::MakeXYWH(0, 1, 1, dstRect.height() - 2);
-    SkRect interior = dstRect.makeInset(1, 1);
+    SkRect interior = SkRect::Make(dstRect.makeInset(1, 1));
     SkRect right = SkRect::MakeXYWH(dstRect.width() - 1, 1, 1, dstRect.height() - 2);
     SkRect bottomLeft = SkRect::MakeXYWH(0, dstRect.height() - 1, 1, 1);
     SkRect bottom = SkRect::MakeXYWH(1, dstRect.height() - 1, dstRect.width() - 2, 1);