Make all SkSurface_* -related devices all have a device

include/core/SkDevice.h

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDevice_DEFINED
 #define SkDevice_DEFINED
 
@@ skipping 105 matching lines @@
      * possibly from SkCanvas' dtor.
      */
     virtual void onDetachFromCanvas() {
         SkASSERT(fAttachedToCanvas);
         this->unlockPixels();
 #ifdef SK_DEBUG
         fAttachedToCanvas = false;
 #endif
     };
 
+    /** This makes the contents of this device undefined.
+     * See SkCanvas::discard()
+     */
+    virtual void discard() { }
+
 protected:
     enum Usage {
        kGeneral_Usage,
        kSaveLayer_Usage,  // <! internal use only
        kImageFilter_Usage // <! internal use only
     };
 
     struct TextFlags {
         uint32_t    fFlags;     // SkPaint::getFlags()
     };
@@ skipping 224 matching lines @@
     friend class SkCanvas;
     friend struct DeviceCM; //for setMatrixClip
     friend class SkDraw;
     friend class SkDrawIter;
     friend class SkDeviceFilteredPaint;
     friend class SkDeviceImageFilterProxy;
     friend class SkDeferredDevice;    // for newSurface
     friend class SkNoPixelsBitmapDevice;
 
     friend class SkSurface_Raster;
+    friend class SkSurface_Gpu;
+    friend class SkGpuDevice;
 
     // used to change the backend's pixels (and possibly config/rowbytes)
     // but cannot change the width/height, so there should be no change to
     // any clip information.
     // TODO: move to SkBitmapDevice
     virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) {}
 
     virtual bool forceConservativeRasterClip() const { return false; }
 
     // just called by SkCanvas when built as a layer
@@ skipping 10 matching lines @@
     SkDeviceProperties* fLeakyProperties;   // will always exist.
 
 #ifdef SK_DEBUG
     bool        fAttachedToCanvas;
 #endif
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif