DM: add --serialize

dm/DMUtil.cpp

 #include "DMUtil.h"
 
+#include "SkPicture.h"
+
 namespace DM {
 
-SkString underJoin(const char* a, const char* b) {
+SkString UnderJoin(const char* a, const char* b) {
     SkString s;
     s.appendf("%s_%s", a, b);
     return s;
 }
 
-SkString png(SkString s) {
+SkString Png(SkString s) {
     s.appendf(".png");
     return s;
 }
 
-bool meetsExpectations(const skiagm::Expectations& expectations, const SkBitmap bitmap) {
+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) {
+    SkCanvas* canvas = picture->beginRecording(SkScalarCeilToInt(gm->width()),
+                                               SkScalarCeilToInt(gm->height()),
+                                               0 /*flags*/);
+    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