Update the SkDocument interface to allow for 1) abort won't emit pdf, 2) close can report success/f…

src/pdf/SkPDFDeviceFlattener.h

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPDFDeviceFlattener_DEFINED
+#define SkPDFDeviceFlattener_DEFINED
+
+#include "SkPDFDevice.h"
+
+class SkPDFDeviceFlattener : public SkPDFDevice {
+private:
+    typedef SkPDFDevice INHERITED;
+
+    SK_API SkPDFDeviceFlattener(const SkSize& pageSize, const SkRect* trimBox = NULL);
+
+public:
+    SK_API virtual ~SkPDFDeviceFlattener();
+
+    virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode,
+                            size_t count, const SkPoint[],
+                            const SkPaint& paint) SK_OVERRIDE;
+    virtual void drawRect(const SkDraw&, const SkRect& r, const SkPaint& paint);
+    virtual void drawPath(const SkDraw&, const SkPath& origpath,
+                          const SkPaint& paint, const SkMatrix* prePathMatrix,
+                          bool pathIsMutable) SK_OVERRIDE;
+    virtual void drawText(const SkDraw&, const void* text, size_t len,
+                          SkScalar x, SkScalar y, const SkPaint&) SK_OVERRIDE;
+    virtual void drawPosText(const SkDraw&, const void* text, size_t len,
+                             const SkScalar pos[], SkScalar constY,
+                             int scalarsPerPos, const SkPaint&) SK_OVERRIDE;
+    virtual void drawTextOnPath(const SkDraw&, const void* text, size_t len,
+                                const SkPath& path, const SkMatrix* matrix,
+                                const SkPaint& paint) SK_OVERRIDE;
+private:
+
+    bool mustFlatten(const SkDraw& d) const;
+    bool mustPathText(const SkDraw& d, const SkPaint& paint);
+
+    friend class SkDocument_PDF;
+};
+
+#endif  // SkPDFDeviceFlattener_DEFINED