Update from https://crrev.com/306655

cc/resources/raster_source_helper.h

+// Copyright 2014 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.
+
+#ifndef CC_RESOURCES_RASTER_SOURCE_HELPER_H_
+#define CC_RESOURCES_RASTER_SOURCE_HELPER_H_
+
+#include "cc/base/cc_export.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/geometry/rect.h"
+
+class SkCanvas;
+
+namespace cc {
+
+class CC_EXPORT RasterSourceHelper {
+ public:
+  static void PrepareForPlaybackToCanvas(SkCanvas* canvas,
+                                         const gfx::Rect& canvas_rect,
+                                         const gfx::Rect& source_rect,
+                                         float contents_scale,
+                                         SkColor background_color,
+                                         bool clear_canvas_with_debug_color,
+                                         bool requires_clear);
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_RASTER_SOURCE_HELPER_H_