ui/gfx: split out code that depends on paint

ui/gfx/shadow_util.cc

 // Copyright 2017 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/gfx/shadow_util.h"
 
 #include <map>
 #include <vector>
 
 #include "base/lazy_instance.h"
 #include "third_party/skia/include/core/SkDrawLooper.h"
 #include "third_party/skia/include/core/SkRRect.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/image/canvas_image_source.h"
 #include "ui/gfx/shadow_value.h"
+#include "ui/gfx/skia_paint_util.h"
 #include "ui/gfx/skia_util.h"
 
 namespace gfx {
 namespace {
 
 // Creates an image with the given shadows painted around a round rect with
 // the given corner radius. The image will be just large enough to paint the
 // shadows appropriately with a 1px square region reserved for "content".
 class ShadowNineboxSource : public CanvasImageSource {
  public:
@@ skipping 77 matching lines @@
                               SkColorSetA(SK_ColorBLACK, 0x1f));
   // To see what this looks like for elevation 24, try this CSS:
   //   box-shadow: 0 24px 48px rgba(0, 0, 0, .24),
   //               0 0 24px rgba(0, 0, 0, .12);
   auto source = new ShadowNineboxSource(shadow->values, corner_radius);
   shadow->ninebox_image = ImageSkia(source, source->size());
   return *shadow;
 }
 
 }  // namespace gfx