Change device factories to take SkImageInfo instead of SkBitmap::Config

tests/LayerDrawLooperTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkDraw.h"
 #include "SkLayerDrawLooper.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkRect.h"
 #include "SkRefCnt.h"
 #include "SkScalar.h"
 #include "SkXfermode.h"
 #include "Test.h"
 
+static SkBitmap make_bm(int w, int h) {
+    SkBitmap bm;
+    bm.allocN32Pixels(w, h);
+    return bm;
+}
+
 class FakeDevice : public SkBitmapDevice {
 public:
-    FakeDevice() : SkBitmapDevice(SkBitmap::kARGB_8888_Config, 100, 100, false) { }
+    FakeDevice() : SkBitmapDevice(make_bm(100, 100)) { }
 
     virtual void drawRect(const SkDraw& draw, const SkRect& r,
                           const SkPaint& paint) SK_OVERRIDE {
         fLastMatrix = *draw.fMatrix;
         INHERITED::drawRect(draw, r, paint);
     }
 
     SkMatrix fLastMatrix;
 
 private:
@@ skipping 112 matching lines @@
 
     // Only two layers were added, so that should be the end.
     REPORTER_ASSERT(reporter, !looper->next(&canvas, &paint));
 }
 
 DEF_TEST(LayerDrawLooper, reporter) {
     test_frontToBack(reporter);
     test_backToFront(reporter);
     test_mixed(reporter);
 }