DM: add --multiPage option

dm/DMSrcSink.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef DMSrcSink_DEFINED
 #define DMSrcSink_DEFINED
 
@@ skipping 148 matching lines @@
 private:
     GrContextFactory::GLContextType fContextType;
     GrGLStandard                    fGpuAPI;
     int                             fSampleCount;
     bool                            fUseDFText;
     bool                            fThreaded;
 };
 
 class PDFSink : public Sink {
 public:
-    PDFSink();
+    PDFSink(bool multiPage = false);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     int enclave() const override { return kAnyThread_Enclave; }
     const char* fileExtension() const override { return "pdf"; }
+
+private:
+    bool fMultiPage;
 };
 
 class XPSSink : public Sink {
 public:
-    XPSSink();
+    XPSSink(bool multiPage = false);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     int enclave() const override { return kAnyThread_Enclave; }
     const char* fileExtension() const override { return "xps"; }
+
+private:
+    bool fMultiPage;
 };
 
 class RasterSink : public Sink {
 public:
     explicit RasterSink(SkColorType);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     int enclave() const override { return kAnyThread_Enclave; }
     const char* fileExtension() const override { return "png"; }
 private:
@@ skipping 87 matching lines @@
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     int enclave() const override { return fSink->enclave(); }
     const char* fileExtension() const override { return fSink->fileExtension(); }
 private:
     SkAutoTDelete<Sink>  fSink;
 };
 
 }  // namespace DM
 
 #endif//DMSrcSink_DEFINED