Make CanvasPainter raster directly to an SkBitmap

ui/views/controls/textfield/textfield.cc

 // Copyright (c) 2012 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 "ui/views/controls/textfield/textfield.h"
 
 #include <string>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
@@ skipping 1045 matching lines @@
   data->SetString(selected_text);
   Label label(selected_text, GetFontList());
   label.SetBackgroundColor(GetBackgroundColor());
   label.SetSubpixelRenderingEnabled(false);
   gfx::Size size(label.GetPreferredSize());
   gfx::NativeView native_view = GetWidget()->GetNativeView();
   display::Display display =
       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);
 }
 
 int Textfield::GetDragOperationsForView(View* sender, const gfx::Point& p) {
   int drag_operations = ui::DragDropTypes::DRAG_COPY;
   if (!enabled() || text_input_type_ == ui::TEXT_INPUT_TYPE_PASSWORD ||
       !GetRenderText()->IsPointInSelection(p)) {
     drag_operations = ui::DragDropTypes::DRAG_NONE;
   } else if (sender == this && !read_only()) {
@@ skipping 989 matching lines @@
 }
 
 void Textfield::OnCursorBlinkTimerFired() {
   DCHECK(ShouldBlinkCursor());
   gfx::RenderText* render_text = GetRenderText();
   render_text->set_cursor_visible(!render_text->cursor_visible());
   RepaintCursor();
 }
 
 }  // namespace views