Replace uses of legacy SkBitmap::copyTo() API

chrome/browser/chromeos/login/screenshot_testing/SkPMetric.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // WARNING! This file is copied from third_party/skia/tools/skpdiff and slightly
 // modified to be compilable outside Skia and suit chromium style. Some comments
 // can make no sense.
 // TODO(elizavetai): remove this file and reuse the original one in Skia
 
 #include <cmath>
@@ skipping 110 matching lines @@
   }
   lab->l = 116.0f * f[1] - 16.0f;
   lab->a = 500.0f * (f[0] - f[1]);
   lab->b = 200.0f * (f[1] - f[2]);
 }
 
 /// Converts a 8888 bitmap to LAB color space and puts it into the output
 static bool bitmap_to_cielab(const SkBitmap* bitmap, ImageLAB* outImageLAB) {
   SkBitmap bm8888;
   if (bitmap->colorType() != kN32_SkColorType) {
-    if (!bitmap->copyTo(&bm8888, kN32_SkColorType)) {
+    SkImageInfo info8888 = bitmap->info().makeColorType(kN32_SkColorType);
+    if (!bm8888.tryAllocPixels(info8888) ||
+        !bitmap->readPixels(info8888, bm8888.getPixels(), bm8888.rowBytes(), 0,
+                            0)) {
       return false;
     }
     bitmap = &bm8888;
   }
 
   int width = bitmap->width();
   int height = bitmap->height();
   DCHECK(outImageLAB->width == width);
   DCHECK(outImageLAB->height == height);
 
@@ skipping 327 matching lines @@
   if (!bitmap_to_cielab(baseline, &baselineLAB) ||
       !bitmap_to_cielab(test, &testLAB)) {
     return true;
   }
 
   result->poiCount = 0;
   result->result = pmetric(&baselineLAB, &testLAB, &result->poiCount);
 
   return true;
 }