Fold gmtoskp into DM, as --src gm --config skp.

dm/DMSrcSink.cpp

 #include "DMSrcSink.h"
 #include "SamplePipeControllers.h"
 #include "SkCommonFlags.h"
 #include "SkDocument.h"
 #include "SkMultiPictureDraw.h"
 #include "SkOSFile.h"
 #include "SkPictureData.h"
 #include "SkPictureRecorder.h"
 #include "SkRandom.h"
 #include "SkStream.h"
@@ skipping 179 matching lines @@
         return err;
     }
     canvas->flush();
     doc->endPage();
     doc->close();
     return "";
 }
 
 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
 
+SKPSink::SKPSink() {}
+
+Error SKPSink::draw(const Src& src, SkBitmap*, SkWStream* dst) const {
+    SkSize size;
+    size = src.size();
+    SkPictureRecorder recorder;
+    Error err = src.draw(recorder.beginRecording(size.width(), size.height()));
+    if (!err.isEmpty()) {
+        return err;
+    }
+    SkAutoTUnref<SkPicture> pic(recorder.endRecording());
+    pic->serialize(dst);
+    return "";
+}
+
+/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
+
 RasterSink::RasterSink(SkColorType colorType) : fColorType(colorType) {}
 
 Error RasterSink::draw(const Src& src, SkBitmap* dst, SkWStream*) const {
     const SkISize size = limit_raster_dimensions(src.size());
     // If there's an appropriate alpha type for this color type, use it, otherwise use premul.
     SkAlphaType alphaType = kPremul_SkAlphaType;
     (void)SkColorTypeValidateAlphaType(fColorType, alphaType, &alphaType);
 
     dst->allocPixels(SkImageInfo::Make(size.width(), size.height(), fColorType, alphaType));
     dst->eraseColor(SK_ColorTRANSPARENT);
@@ skipping 142 matching lines @@
             surfaces.unrefAll();
             return "";
         }
         SkISize size() const SK_OVERRIDE { return fSize; }
         Name name() const SK_OVERRIDE { sk_throw(); return ""; }  // No one should be calling this.
     } proxy(fW, fH, pic, src.size());
     return fSink->draw(proxy, bitmap, stream);
 }
 
 }  // namespace DM