XPS, DM: add SkDocument::CreateXPS

dm/DMSrcSink.h

 #ifndef DMSrcSink_DEFINED
 #define DMSrcSink_DEFINED
 
 #include "DMGpuSupport.h"
 #include "SkBBHFactory.h"
 #include "SkBBoxHierarchy.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkGPipe.h"
@@ skipping 101 matching lines @@
 
 class PDFSink : public Sink {
 public:
     PDFSink();
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const SK_OVERRIDE;
     int enclave() const SK_OVERRIDE { return kAnyThread_Enclave; }
     const char* fileExtension() const SK_OVERRIDE { return "pdf"; }
 };
 
+class XPSSink : public Sink {
+public:
+    XPSSink();
+
+    Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const SK_OVERRIDE;
+    int enclave() const SK_OVERRIDE { return kAnyThread_Enclave; }
+    const char* fileExtension() const SK_OVERRIDE { return "xps"; }
+};
+
 class RasterSink : public Sink {
 public:
     explicit RasterSink(SkColorType);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const SK_OVERRIDE;
     int enclave() const SK_OVERRIDE { return kAnyThread_Enclave; }
     const char* fileExtension() const SK_OVERRIDE { return "png"; }
 private:
     SkColorType    fColorType;
 };
@@ skipping 74 matching lines @@
     const char* fileExtension() const SK_OVERRIDE { return fSink->fileExtension(); }
 private:
     const int                   fW, fH;
     SkAutoTDelete<SkBBHFactory> fFactory;
     SkAutoTDelete<Sink>         fSink;
 };
 
 }  // namespace DM
 
 #endif//DMSrcSink_DEFINED