BuildLumaHistogram() attempts to access Skia pixel data directly. This isn't

ui/gfx/color_utils.cc

Index: ui/gfx/color_utils.cc
===================================================================
--- ui/gfx/color_utils.cc	(revision 201894)
+++ ui/gfx/color_utils.cc	(working copy)
@@ -197,15 +197,12 @@
   DCHECK_EQ(SkBitmap::kARGB_8888_Config, bitmap.config());
 
   SkAutoLockPixels bitmap_lock(bitmap);
-  if (!bitmap.getPixels())
-    return;
 
   int pixel_width = bitmap.width();
   int pixel_height = bitmap.height();
   for (int y = 0; y < pixel_height; ++y) {
-    SkColor* current_color = static_cast<uint32_t*>(bitmap.getAddr32(0, y));
-    for (int x = 0; x < pixel_width; ++x, ++current_color)
-      histogram[GetLuminanceForColor(*current_color)]++;
+    for (int x = 0; x < pixel_width; ++x)
+      ++histogram[GetLuminanceForColor(bitmap.getColor(x, y))];
   }
 }