add heuristic to pour small pictures into recordings, rather than ref'ing

tests/PictureTest.cpp

 /*
  * Copyright 2012 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 "SkBlurImageFilter.h"
 #include "SkCanvas.h"
@@ skipping 1109 matching lines @@
     // Protect against any unintentional bloat.
     size_t approxUsed = SkPictureUtils::ApproximateBytesUsed(empty.get());
     REPORTER_ASSERT(reporter, approxUsed <= 432);
 
     // Sanity check of nested SkPictures.
     SkPictureRecorder r2;
     r2.beginRecording(0, 0);
     r2.getRecordingCanvas()->drawPicture(empty.get());
     SkAutoTUnref<SkPicture> nested(r2.endRecording());
 
-    REPORTER_ASSERT(reporter, SkPictureUtils::ApproximateBytesUsed(nested.get()) >
+    REPORTER_ASSERT(reporter, SkPictureUtils::ApproximateBytesUsed(nested.get()) >=
                               SkPictureUtils::ApproximateBytesUsed(empty.get()));
 }
 
 DEF_TEST(Picture, reporter) {
 #ifdef SK_DEBUG
     test_deleting_empty_picture();
     test_serializing_empty_picture();
 #else
     test_bad_bitmap();
 #endif
@@ skipping 175 matching lines @@
 DEF_TEST(Picture_getRecordingCanvas, r) {
     SkPictureRecorder rec;
     REPORTER_ASSERT(r, !rec.getRecordingCanvas());
     for (int i = 0; i < 3; i++) {
         rec.beginRecording(100, 100);
         REPORTER_ASSERT(r, rec.getRecordingCanvas());
         rec.endRecording()->unref();
         REPORTER_ASSERT(r, !rec.getRecordingCanvas());
     }
 }