Fix trace event categories in src/gpu ("skia"->"skia.gpu")

Change-Id: I74b041d3f820d423601bd06805edec001a0d980e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225256
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/ops/GrFillRectOp.cpp b/src/gpu/ops/GrFillRectOp.cpp
index fe3cc65..2c17153 100644
--- a/src/gpu/ops/GrFillRectOp.cpp
+++ b/src/gpu/ops/GrFillRectOp.cpp
@@ -187,7 +187,7 @@
             const GrUserStencilSettings*);
 
     void onPrepareDraws(Target* target) override {
-        TRACE_EVENT0("skia", TRACE_FUNC);
+        TRACE_EVENT0("skia.gpu", TRACE_FUNC);
 
         using Domain = GrQuadPerEdgeAA::Domain;
         static constexpr SkRect kEmptyDomain = SkRect::MakeEmpty();
@@ -241,7 +241,7 @@
     }
 
     CombineResult onCombineIfPossible(GrOp* t, const GrCaps& caps) override {
-        TRACE_EVENT0("skia", TRACE_FUNC);
+        TRACE_EVENT0("skia.gpu", TRACE_FUNC);
         const auto* that = t->cast<FillRectOp>();
 
         if ((fHelper.aaType() == GrAAType::kCoverage ||