Revert "Revert "add new signature so skia can rely on it (subclass of SkDevice)""

skia/ext/bitmap_platform_device_mac.cc

Index: skia/ext/bitmap_platform_device_mac.cc
diff --git a/skia/ext/bitmap_platform_device_mac.cc b/skia/ext/bitmap_platform_device_mac.cc
index 9c7966da07dc9e1a7f4dee78338508142834e366..1ad23e67ee166a643b00c4f458d9db6e989e38f7 100644
--- a/skia/ext/bitmap_platform_device_mac.cc
+++ b/skia/ext/bitmap_platform_device_mac.cc
@@ -280,6 +280,14 @@ SkBaseDevice* BitmapPlatformDevice::onCreateCompatibleDevice(
   return Create(NULL, info.width(), info.height(), info.isOpaque(), do_clear);
 }
 
+SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& cinfo,
+                                                   const SkPaint*) {
+  const SkImageInfo& info = cinfo.fInfo;
+  const bool do_clear = !info.isOpaque();
+  SkASSERT(info.colorType() == kN32_SkColorType);
+  return Create(NULL, info.width(), info.height(), info.isOpaque(), do_clear);
+}
+
 // PlatformCanvas impl
 
 SkCanvas* CreatePlatformCanvas(CGContextRef ctx, int width, int height,