replace setConfig+allocPixels with single call

tests/ImageDecodingTest.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 "SkCanvas.h"
 #include "SkColor.h"
@@ skipping 150 matching lines @@
     } else {
         SkDebugf("Failed to find any files :(\n");
     }
 }
 
 #ifdef SK_DEBUG
 // Create a stream containing a bitmap encoded to Type type.
 static SkMemoryStream* create_image_stream(SkImageEncoder::Type type) {
     SkBitmap bm;
     const int size = 50;
-    bm.setConfig(SkBitmap::kARGB_8888_Config, size, size);
-    bm.allocPixels();
+    bm.allocN32Pixels(size, size);
     SkCanvas canvas(bm);
     SkPoint points[2] = {
         { SkIntToScalar(0), SkIntToScalar(0) },
         { SkIntToScalar(size), SkIntToScalar(size) }
     };
     SkColor colors[2] = { SK_ColorWHITE, SK_ColorBLUE };
     SkShader* shader = SkGradientShader::CreateLinear(points, colors, NULL,
                                                       SK_ARRAY_COUNT(colors),
                                                       SkShader::kClamp_TileMode);
     SkPaint paint;
@@ skipping 173 matching lines @@
  *  SkInstallDiscardablePixelRef functions.
  */
 DEF_TEST(ImprovedBitmapFactory, reporter) {
     SkString resourcePath = skiatest::Test::GetResourcePath();
     SkString directory = SkOSPath::SkPathJoin(resourcePath.c_str(), "encoding");
     SkString path = SkOSPath::SkPathJoin(directory.c_str(), "randPixels.png");
     SkAutoTUnref<SkStreamRewindable> stream(
         SkStream::NewFromFile(path.c_str()));
     if (sk_exists(path.c_str())) {
         SkBitmap bm;
-        SkAssertResult(bm.setConfig(SkBitmap::kARGB_8888_Config, 1, 1));
+        SkAssertResult(bm.setConfig(SkImageInfo::MakeN32Premul(1, 1)));
         REPORTER_ASSERT(reporter,
             NULL != install_pixel_ref(&bm, stream.detach(), 1, true));
         SkAutoLockPixels alp(bm);
         REPORTER_ASSERT(reporter, NULL != bm.getPixels());
     }
 }
 
 
 ////////////////////////////////////////////////////////////////////////////////
 
@@ skipping 192 matching lines @@
                     }
                     SkDecodingImageGenerator::Options options(scaleList[i],
                                                               ditherList[j]);
                     test_options(reporter, options, encodedStream, encodedData,
                                  useDataList[m], path);
                 }
             }
         }
     }
 }