DM: add pdf

dm/DMWriteTask.h

Index: dm/DMWriteTask.h
diff --git a/dm/DMWriteTask.h b/dm/DMWriteTask.h
index a90f66aec59a19ad578e1549f62ac3a03fcb2c9e..c2c1d9fd4773641b926dfdce1bf304a7e2c1d652 100644
--- a/dm/DMWriteTask.h
+++ b/dm/DMWriteTask.h
@@ -15,8 +15,12 @@ namespace DM {
 class WriteTask : public CpuTask {
 
 public:
-    WriteTask(const Task& parent,    // WriteTask must be a child Task.  Pass its parent here.
-              SkBitmap bitmap);      // Bitmap to write.
+    WriteTask(const Task& parent,  // WriteTask must be a child task.
+              SkBitmap bitmap);    // Bitmap to encode to PNG and write to disk.
+
+    WriteTask(const Task& parent,   // WriteTask must be a child task.
+              SkData *data,         // Pre-encoded data to write to disk.
+              const char* ext);     // File extension.
 
     virtual void draw() SK_OVERRIDE;
     virtual bool shouldSkip() const SK_OVERRIDE;
@@ -34,8 +38,10 @@ public:
 
 private:
     SkTArray<SkString> fSuffixes;
-    SkString fGmName;
+    const SkString fGmName;
     const SkBitmap fBitmap;
+    SkAutoTUnref<SkData> fData;
+    const char* fExtension;
 
     void makeDirOrFail(SkString dir);
 };