change SkDraw and all Blitters to use pixmap instead of bitmap

src/core/SkScan_Path.cpp

 /*
  * Copyright 2006 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.
  */
 
 #include "SkScanPriv.h"
 #include "SkBlitter.h"
 #include "SkEdge.h"
@@ skipping 326 matching lines @@
     }
     void blitV(int x, int y, int height, SkAlpha alpha) override {
         SkDEBUGFAIL("blitV unexpected");
     }
     void blitRect(int x, int y, int width, int height) override {
         SkDEBUGFAIL("blitRect unexpected");
     }
     void blitMask(const SkMask&, const SkIRect& clip) override {
         SkDEBUGFAIL("blitMask unexpected");
     }
-    const SkBitmap* justAnOpaqueColor(uint32_t* value) override {
+    const SkPixmap* justAnOpaqueColor(uint32_t* value) override {
         SkDEBUGFAIL("justAnOpaqueColor unexpected");
         return NULL;
     }
 
 private:
     SkBlitter*  fBlitter;
     int         fFirstX, fLastX, fPrevX;
 };
 
 static void PrePostInverseBlitterProc(SkBlitter* blitter, int y, bool isStart) {
@@ skipping 342 matching lines @@
         clipRgn = &wrap.getRgn();
         blitter = wrap.getBlitter();
     }
 
     SkScanClipper clipper(blitter, clipRgn, ir);
     blitter = clipper.getBlitter();
     if (blitter) {
         sk_fill_triangle(pts, clipper.getClipRect(), blitter, ir);
     }
 }