Make drawImage a virtual on SkDevice

src/pipe/SkGPipePriv.h

Index: src/pipe/SkGPipePriv.h
diff --git a/src/pipe/SkGPipePriv.h b/src/pipe/SkGPipePriv.h
index 736930b652e2e020dbc51a5bfc5f09e18b26330f..c3919f635bd6232221d51eb37a08266a0bf1f5b5 100644
--- a/src/pipe/SkGPipePriv.h
+++ b/src/pipe/SkGPipePriv.h
@@ -43,6 +43,8 @@ enum DrawOps {
     kDrawBitmapNine_DrawOp,
     kDrawBitmapRectToRect_DrawOp,
     kDrawDRRect_DrawOp,
+    kDrawImage_DrawOp,
+    kDrawImageRect_DrawOp,
     kDrawOval_DrawOp,
     kDrawPaint_DrawOp,
     kDrawPatch_DrawOp,
@@ -79,6 +81,7 @@ enum DrawOps {
     // these are signals to playback, not drawing verbs
     kReportFlags_DrawOp,
     kShareBitmapHeap_DrawOp,
+    kShareImageHeap_DrawOp,
     kDone_DrawOp,
 };
 
@@ -141,6 +144,7 @@ enum {
     kDrawVertices_HasIndices_DrawOpFlag  = 1 << 2,
     kDrawVertices_HasXfermode_DrawOpFlag = 1 << 3,
 };
+// These are shared between drawbitmap and drawimage
 enum {
     kDrawBitmap_HasPaint_DrawOpFlag   = 1 << 0,
     // Specific to drawBitmapRect, but needs to be different from HasPaint,
@@ -213,6 +217,22 @@ static inline bool shouldFlattenBitmaps(uint32_t flags) {
             && !(flags & SkGPipeWriter::kSharedAddressSpace_Flag));
 }
 
+class SkImageHeap : public SkRefCnt {
+public:
+    SkImageHeap();
+    virtual ~SkImageHeap();
+
+    // slot must be "valid" -- 0 is never valid
+    const SkImage* get(int32_t slot) const;
+    // returns 0 if not found, else returns slot
+    int32_t find(const SkImage*) const;
+    // returns non-zero value for where the image was stored
+    int32_t insert(const SkImage*);
+
+private:
+    SkTDArray<const SkImage*> fArray;
+};
+
 ///////////////////////////////////////////////////////////////////////////////
 
 enum PaintOps {