replace setConfig+allocPixels with single call

tests/SkpSkGrTest.cpp

 #if !SK_SUPPORT_GPU
 #error "GPU support required"
 #endif
 
 #include "GrContext.h"
 #include "GrContextFactory.h"
 #include "GrRenderTarget.h"
 #include "SkGpuDevice.h"
 #include "gl/GrGLDefines.h"
 
@@ skipping 407 matching lines @@
         int maxWH = context->getMaxRenderTargetSize();
         int scale = 1;
         while (pLargerWH / scale > maxWH) {
             scale *= 2;
         }
         SkBitmap bitmap;
         SkIPoint dim;
         do {
             dim.fX = (pWidth + scale - 1) / scale;
             dim.fY = (pHeight + scale - 1) / scale;
-            bitmap.setConfig(SkBitmap::kARGB_8888_Config, dim.fX, dim.fY);
-            bool success = bitmap.allocPixels();
+            bool success = bitmap.allocN32Pixels(, dim.fX, dim.fY);
             if (success) {
                 break;
             }
             SkDebugf("-%d-", scale);
         } while ((scale *= 2) < 256);
         if (scale >= 256) {
             SkDebugf("unable to allocate bitmap for %s (w=%d h=%d) (sw=%d sh=%d)\n",
                     fFilename, pWidth, pHeight, dim.fX, dim.fY);
             goto finish;
         }
@@ skipping 303 matching lines @@
     int testIndex = 166;
     int dirIndex = skipOverSkGr[testIndex - 166].directory;
     SkString pictDir = make_in_dir_name(dirIndex);
     if (pictDir.size() == 0) {
         return;
     }
     SkString filename(skipOverSkGr[testIndex - 166].filename);
     TestResult::Test(dirIndex, filename.c_str(), kCompareBits, reporter->verbose());
     TestResult::Test(dirIndex, filename.c_str(), kEncodeFiles, reporter->verbose());
 }