Add trace event to SkPicture analysis.

src/core/SkBigPicture.cpp

Index: src/core/SkBigPicture.cpp
diff --git a/src/core/SkBigPicture.cpp b/src/core/SkBigPicture.cpp
index f7d6bd421588172eb45d105f4742ddf4f284af10..02011ee745c558ff0bfd81d6d41c3275e6b9939a 100644
--- a/src/core/SkBigPicture.cpp
+++ b/src/core/SkBigPicture.cpp
@@ -10,6 +10,7 @@
 #include "SkPictureCommon.h"
 #include "SkRecord.h"
 #include "SkRecordDraw.h"
+#include "SkTraceEvent.h"
 
 SkBigPicture::SkBigPicture(const SkRect& cull,
                            SkRecord* record,
@@ -81,6 +82,7 @@ SkPicture const* const* SkBigPicture::drawablePicts() const {
 }
 
 SkBigPicture::Analysis::Analysis(const SkRecord& record) {
+    TRACE_EVENT0("disabled-by-default-skia", "SkBigPicture::Analysis::Analysis()");
     SkTextHunter   text;
     SkBitmapHunter bitmap;
     SkPathCounter  path;