Make SkGpuDevice know its alpha type

tests/ReadWriteAlphaTest.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 "Test.h"
 
 // This test is specific to the GPU backend.
@@ skipping 65 matching lines @@
                 if (textureData[x][y] != readback[x][y]) {
                     match = false;
                 }
             }
         }
 
         REPORTER_ASSERT(reporter, match);
 
         // Now try writing on the single channel texture
         SkSurfaceProps props(SkSurfaceProps::kLegacyFontHost_InitType);
-        SkAutoTUnref<SkBaseDevice> device(SkGpuDevice::Create(texture->asRenderTarget(), &props));
+        SkAutoTUnref<SkBaseDevice> device(SkGpuDevice::Create(texture->asRenderTarget(), &props,
+                                                              SkGpuDevice::kUninit_InitContents));
         SkCanvas canvas(device);
 
         SkPaint paint;
 
         const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10);
 
         paint.setColor(SK_ColorWHITE);
 
         canvas.drawRect(rect, paint);
 
         texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
                             readback, 0);
 
         match = true;
 
         for (int y = 0; y < Y_SIZE; ++y) {
             for (int x = 0; x < X_SIZE; ++x) {
                 if (0xFF != readback[x][y]) {
                     match = false;
                 }
             }
         }
 
         REPORTER_ASSERT(reporter, match);
     }
 }
 
 #endif