DM: add --rtree.

dm/DMUtil.cpp

 #include "DMUtil.h"
 
 #include "SkPicture.h"
 
 namespace DM {
 
 SkString UnderJoin(const char* a, const char* b) {
     SkString s;
     s.appendf("%s_%s", a, b);
     return s;
 }
 
 SkString Png(SkString s) {
     s.appendf(".png");
     return s;
 }
 
 bool MeetsExpectations(const skiagm::Expectations& expectations, const SkBitmap bitmap) {
     if (expectations.ignoreFailure() || expectations.empty()) {
         return true;
     }
     const skiagm::GmResultDigest digest(bitmap);
     return expectations.match(digest);
 }
 
-void RecordPicture(skiagm::GM* gm, SkPicture* picture) {
+void RecordPicture(skiagm::GM* gm, SkPicture* picture, uint32_t recordFlags) {
     SkCanvas* canvas = picture->beginRecording(SkScalarCeilToInt(gm->width()),
                                                SkScalarCeilToInt(gm->height()),
-                                               0 /*flags*/);
+                                               recordFlags);
     canvas->concat(gm->getInitialTransform());
     gm->draw(canvas);
     canvas->flush();
     picture->endRecording();
 }
 
 void SetupBitmap(const SkBitmap::Config config, skiagm::GM* gm, SkBitmap* bitmap) {
     bitmap->setConfig(config, SkScalarCeilToInt(gm->width()), SkScalarCeilToInt(gm->height()));
     bitmap->allocPixels();
     bitmap->eraseColor(0x00000000);
 }
 
 void DrawPicture(SkPicture* picture, SkBitmap* bitmap) {
     SkASSERT(picture != NULL);
     SkASSERT(bitmap != NULL);
     SkCanvas canvas(*bitmap);
     canvas.drawPicture(*picture);
     canvas.flush();
 }
 
 bool BitmapsEqual(const SkBitmap& a, const SkBitmap& b) {
     const SkAutoLockPixels lockA(a), lockB(b);
     return a.getSize() == b.getSize() && 0 == memcmp(a.getPixels(), b.getPixels(), b.getSize());
 }
 
 }  // namespace DM