replace setConfig+allocPixels with single call

tests/PathOpsSkpClipTest.cpp

 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkColor.h"
 #include "SkColorPriv.h"
 #include "SkDevice.h"
 #include "SkGraphics.h"
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkOSFile.h"
@@ skipping 385 matching lines @@
             SkDebugf("unable to decode %s\n", fFilename);
             goto finish;
         }
         int width = pic->width();
         int height = pic->height();
         SkBitmap oldBitmap, opBitmap;
         int scale = 1;
         do {
             int dimX = (width + scale - 1) / scale;
             int dimY = (height + scale - 1) / scale;
-            oldBitmap.setConfig(SkBitmap::kARGB_8888_Config, dimX, dimY);
-            opBitmap.setConfig(SkBitmap::kARGB_8888_Config, dimX, dimY);
-            bool success = oldBitmap.allocPixels() && opBitmap.allocPixels();
-            if (success) {
+            if (oldBitmap.allocN32Pixels(dimX, dimY) &&
+                opBitmap.allocN32Pixels(dimX, dimY)) {
                 break;
             }
             SkDebugf("-%d-", scale);
         } while ((scale *= 2) < 256);
         if (scale >= 256) {
             SkDebugf("unable to allocate bitmap for %s (w=%d h=%d)\n", fFilename,
                     width, height);
             return;
         }
         oldBitmap.eraseColor(SK_ColorWHITE);
@@ skipping 250 matching lines @@
     SkAssertResult(make_in_dir_name(dirNo).size());
     SkString filename(skipOverSept[testIndex].filename);
     TestResult state;
     state.test(dirNo, filename);
     if (reporter->verbose()) {
         SkDebugf("%s", state.status().c_str());
     }
     state.fTestStep = kEncodeFiles;
     state.testOne();
 }