Fix pngencoder mac perf errors - the previous code was never actually doing a...

base/gfx/png_encoder.cc

 // Copyright (c) 2006-2008 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.
 
 #include "base/basictypes.h"
 #include "base/gfx/png_encoder.h"
 #include "base/logging.h"
 #include "base/scoped_ptr.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
@@ skipping 183 matching lines @@
   return true;
 }
 
 // static
 bool PNGEncoder::EncodeBGRASkBitmap(const SkBitmap& input,
                                     bool discard_transparency,
                                     std::vector<unsigned char>* output) {
   static const int bbp = 4;
 
   SkAutoLockPixels lock_input(input);
-  CHECK(!input.empty());
-  CHECK(input.bytesPerPixel() == bbp);
-  CHECK(input.getConfig() == SkBitmap::kARGB_8888_Config);
-  CHECK(input.width() > 1 && input.height() > 1);
+  DCHECK(input.bytesPerPixel() == bbp);
+  DCHECK(input.getConfig() == SkBitmap::kARGB_8888_Config);
+  DCHECK(input.width() > 1 && input.height() > 1);
 
   // SkBitmaps are premultiplied, we need to unpremultiply them.
   scoped_array<unsigned char> divided(
       new unsigned char[input.width() * input.height() * bbp]);
 
   int i = 0;
   for (int y = 0; y < input.height(); y++) {
     for (int x = 0; x < input.width(); x++) {
       uint32 pixel = input.getAddr32(0, y)[x];
 
@@ skipping 10 matching lines @@
         divided[i + 3] = alpha;
       }
       i += bbp;
     }
   }
 
   return Encode(divided.get(),
                 PNGEncoder::FORMAT_RGBA, input.width(), input.height(),
                 input.width() * bbp, discard_transparency, output);
 }