change asABitmap to isABitmap on shader

tests/PictureTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBBoxHierarchy.h"
 #include "SkBlurImageFilter.h"
 #include "SkCanvas.h"
@@ skipping 53 matching lines @@
         SkPaint paint;
         // CreateBitmapShader is too smart for us; an empty (or 1x1) bitmap shader
         // gets optimized into a non-bitmap form, so we create a 2x2 bitmap here.
         SkBitmap bitmap;
         bitmap.allocPixels(SkImageInfo::MakeN32Premul(2, 2));
         bitmap.eraseColor(SK_ColorBLUE);
         *(bitmap.getAddr32(0, 0)) = SK_ColorGREEN;
         SkShader* shader = SkShader::CreateBitmapShader(bitmap, SkShader::kClamp_TileMode,
                                                         SkShader::kClamp_TileMode);
         paint.setShader(shader)->unref();
-        REPORTER_ASSERT(reporter,
-                        shader->asABitmap(NULL, NULL, NULL) == SkShader::kDefault_BitmapType);
+        REPORTER_ASSERT(reporter, shader->isABitmap());
 
         canvas->drawRect(SkRect::MakeWH(10, 10), paint);
     }
     picture.reset(recorder.endRecording());
     REPORTER_ASSERT(reporter, picture->willPlayBackBitmaps());
 }
 
 
 #ifdef SK_DEBUG
 // Ensure that deleting an empty SkPicture does not assert. Asserts only fire
@@ skipping 1269 matching lines @@
 
     SkAutoTDelete<SkStream> rstream(wstream.detachAsStream());
     SkAutoTUnref<SkPicture> deserializedPicture(SkPicture::CreateFromStream(rstream));
 
     REPORTER_ASSERT(r, SkToBool(deserializedPicture));
     REPORTER_ASSERT(r, deserializedPicture->cullRect().left() == 1);
     REPORTER_ASSERT(r, deserializedPicture->cullRect().top() == 2);
     REPORTER_ASSERT(r, deserializedPicture->cullRect().right() == 3);
     REPORTER_ASSERT(r, deserializedPicture->cullRect().bottom() == 4);
 }