Add trace event to SkPicture analysis.

src/core/SkBigPicture.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBBoxHierarchy.h"
 #include "SkBigPicture.h"
 #include "SkPictureCommon.h"
 #include "SkRecord.h"
 #include "SkRecordDraw.h"
+#include "SkTraceEvent.h"
 
 SkBigPicture::SkBigPicture(const SkRect& cull,
                            SkRecord* record,
                            SnapshotArray* drawablePicts,
                            SkBBoxHierarchy* bbh,
                            AccelData* accelData,
                            size_t approxBytesUsedBySubPictures)
     : fCullRect(cull)
     , fApproxBytesUsedBySubPictures(approxBytesUsedBySubPictures)
     , fRecord(record)               // Take ownership of caller's ref.
@@ skipping 51 matching lines @@
 
 int SkBigPicture::drawableCount() const {
     return fDrawablePicts ? fDrawablePicts->count() : 0;
 }
 
 SkPicture const* const* SkBigPicture::drawablePicts() const {
     return fDrawablePicts ? fDrawablePicts->begin() : nullptr;
 }
 
 SkBigPicture::Analysis::Analysis(const SkRecord& record) {
+    TRACE_EVENT0("disabled-by-default-skia", "SkBigPicture::Analysis::Analysis()");
     SkTextHunter   text;
     SkBitmapHunter bitmap;
     SkPathCounter  path;
 
     bool hasText = false, hasBitmap = false;
     for (int i = 0; i < record.count(); i++) {
         hasText   = hasText   || record.visit<bool>(i,   text);
         hasBitmap = hasBitmap || record.visit<bool>(i, bitmap);
         record.visit<void>(i, path);
     }
 
     fHasText                    = hasText;
     fWillPlaybackBitmaps        = hasBitmap;
     fNumSlowPathsAndDashEffects = SkTMin<int>(path.fNumSlowPathsAndDashEffects, 255);
 }