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

skia/ext/bitmap_platform_device_cairo.cc

Index: skia/ext/bitmap_platform_device_cairo.cc
diff --git a/skia/ext/bitmap_platform_device_cairo.cc b/skia/ext/bitmap_platform_device_cairo.cc
index a331bed0612ede805a9037976aeedaa8daceffd9..92a9d66e0397bfb64d9ed307189c7673f58e89bb 100644
--- a/skia/ext/bitmap_platform_device_cairo.cc
+++ b/skia/ext/bitmap_platform_device_cairo.cc
@@ -174,6 +174,13 @@ SkBaseDevice* BitmapPlatformDevice::onCreateCompatibleDevice(
                                       info.fInfo.isOpaque());
 }
 
+SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& info,
+                                                   const SkPaint*) {
+  SkASSERT(info.fInfo.colorType() == kN32_SkColorType);
+  return BitmapPlatformDevice::Create(info.fInfo.width(), info.fInfo.height(),
+                                      info.fInfo.isOpaque());
+}
+
 cairo_t* BitmapPlatformDevice::BeginPlatformPaint() {
   LoadConfig();
   cairo_surface_t* surface = cairo_get_target(cairo_);