Split SkDevice into SkBaseDevice and SkBitmapDevice

src/utils/SkPictureUtils.cpp

Index: src/utils/SkPictureUtils.cpp
===================================================================
--- src/utils/SkPictureUtils.cpp	(revision 10711)
+++ src/utils/SkPictureUtils.cpp	(working copy)
@@ -47,7 +47,7 @@
  *  It should never actually draw anything, so there need not be any pixels
  *  behind its device-bitmap.
  */
-class GatherPixelRefDevice : public SkDevice {
+class GatherPixelRefDevice : public SkRasterDevice {
 private:
     PixelRefSet*  fPRSet;
 
@@ -70,7 +70,7 @@
     }
 
 public:
-    GatherPixelRefDevice(const SkBitmap& bm, PixelRefSet* prset) : SkDevice(bm) {
+    GatherPixelRefDevice(const SkBitmap& bm, PixelRefSet* prset) : SkRasterDevice(bm) {
         fPRSet = prset;
     }
 
@@ -149,6 +149,9 @@
         not_supported();
         return false;
     }
+
+private:
+    typedef SkRasterDevice INHERITED;
 };
 
 class NoSaveLayerCanvas : public SkCanvas {