Make CanvasPainter raster directly to an SkBitmap

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index c9987ca6331d2b1b83eb0dec90978aea00a7dd30..c9f3156edc502bca02b1e8ebb365d53f5ed83555 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -1063,16 +1063,21 @@ void Textfield::WriteDragDataForView(View* sender,
       display::Screen::GetScreen()->GetDisplayNearestWindow(native_view);
   size.SetToMin(gfx::Size(display.size().width(), height()));
   label.SetBoundsRect(gfx::Rect(size));
-  std::unique_ptr<gfx::Canvas> canvas(
-      GetCanvasForDragImage(GetWidget(), label.size()));
   label.SetEnabledColor(GetTextColor());
+
+  SkBitmap bitmap;
+  float raster_scale = GetDeviceScaleForNativeView(GetWidget());
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   // Desktop Linux Aura does not yet support transparency in drag images.
-  canvas->DrawColor(GetBackgroundColor());
+  SkColor color(GetBackgroundColor());

[tapted, 2017/02/14 23:34:07]

color = (same below)

+#else
+  SkColor color(SK_ColorTRANSPARENT);
 #endif
-  label.Paint(ui::CanvasPainter(canvas.get(), 1.f).context());
+  label.Paint(
+      ui::CanvasPainter(&bitmap, label.size(), raster_scale, color).context());
   const gfx::Vector2d kOffset(-15, 0);
-  drag_utils::SetDragImageOnDataObject(*canvas, kOffset, data);
+  gfx::ImageSkia image(gfx::ImageSkiaRep(bitmap, raster_scale));
+  drag_utils::SetDragImageOnDataObject(image, kOffset, data);
   if (controller_)
     controller_->OnWriteDragData(data);
 }