DM: also run benches once.

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;
 }
 
 void RecordPicture(skiagm::GM* gm, SkPicture* picture, uint32_t recordFlags) {
     const SkISize size = gm->getISize();
     SkCanvas* canvas = picture->beginRecording(size.width(), size.height(), recordFlags);
     canvas->concat(gm->getInitialTransform());
     gm->draw(canvas);
     canvas->flush();
     picture->endRecording();
 }
 
+static void setup_bitmap(SkColorType ct, int width, int height, SkBitmap* bitmap) {
+    bitmap->allocPixels(SkImageInfo::Make(width, height, ct, kPremul_SkAlphaType));
+    bitmap->eraseColor(0x00000000);
+}
+
 void SetupBitmap(const SkColorType ct, skiagm::GM* gm, SkBitmap* bitmap) {
-    const SkISize size = gm->getISize();
-    bitmap->allocPixels(SkImageInfo::Make(size.width(), size.height(),
-                                          ct, kPremul_SkAlphaType));
-    bitmap->eraseColor(0x00000000);
+    setup_bitmap(ct, gm->getISize().width(), gm->getISize().height(), bitmap);
+}
+
+void SetupBitmap(const SkColorType ct, SkBenchmark* bench, SkBitmap* bitmap) {
+    setup_bitmap(ct, bench->getSize().x(), bench->getSize().y(), bitmap);
 }
 
 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