Automatically prepend "disabled-by-default-" to TRACE categories

Ensures that all Skia events are disabled by default in Chrome, and
eliminates redundant typing.

Bug: skia:
Change-Id: I289c5e5a01084fcf4cccf512da65a4727f4aeca2
Reviewed-on: https://skia-review.googlesource.com/26880
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/src/gpu/vk/GrVkCopyManager.cpp b/src/gpu/vk/GrVkCopyManager.cpp
index 08eb4f0..47c17ab 100644
--- a/src/gpu/vk/GrVkCopyManager.cpp
+++ b/src/gpu/vk/GrVkCopyManager.cpp
@@ -34,7 +34,7 @@
 GrVkCopyManager::~GrVkCopyManager() {}
 
 bool GrVkCopyManager::createCopyProgram(GrVkGpu* gpu) {
-    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("skia"), TRACE_FUNC);
+    TRACE_EVENT0("skia", TRACE_FUNC);
 
     const GrShaderCaps* shaderCaps = gpu->caps()->shaderCaps();
     const char* version = shaderCaps->versionDeclString();