Aura overlay scrollbars adjust color for dark backgrounds

ui/native_theme/native_theme_base.h

 // 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.
 
 #ifndef UI_NATIVE_THEME_NATIVE_THEME_BASE_H_
 #define UI_NATIVE_THEME_NATIVE_THEME_BASE_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 22 matching lines @@
              Part part,
              State state,
              const gfx::Rect& rect,
              const ExtraParams& extra) const override;
 
   void PaintStateTransition(SkCanvas* canvas,
                             Part part,
                             State startState,
                             State endState,
                             double progress,
-                            const gfx::Rect& rect) const override;
+                            const gfx::Rect& rect,
+                            ScrollbarOverlayColorTheme theme) const override;
 
  protected:
   NativeThemeBase();
   ~NativeThemeBase() override;
 
   // Draw the arrow. Used by scrollbar and inner spin button.
   virtual void PaintArrowButton(
       SkCanvas* gc,
       const gfx::Rect& rect,
       Part direction,
       State state) const;
   // Paint the scrollbar track. Done before the thumb so that it can contain
   // alpha.
   virtual void PaintScrollbarTrack(
       SkCanvas* canvas,
       Part part,
       State state,
       const ScrollbarTrackExtraParams& extra_params,
       const gfx::Rect& rect) const;
   // Draw the scrollbar thumb over the track.
   virtual void PaintScrollbarThumb(
       SkCanvas* canvas,
       Part part,
       State state,
-      const gfx::Rect& rect) const;
+      const gfx::Rect& rect,
+      NativeTheme::ScrollbarOverlayColorTheme theme) const;
 
   virtual void PaintScrollbarCorner(SkCanvas* canvas,
                                     State state,
                                     const gfx::Rect& rect) const;
 
   virtual void PaintCheckbox(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
       const ButtonExtraParams& button) const;
@@ skipping 50 matching lines @@
       State state,
       const gfx::Rect& rect,
       const InnerSpinButtonExtraParams& spin_button) const;
 
   virtual void PaintProgressBar(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
       const ProgressBarExtraParams& progress_bar) const;
 
-  virtual void PaintScrollbarThumbStateTransition(SkCanvas* canvas,
-                                                  Part part,
-                                                  State startState,
-                                                  State endState,
-                                                  double progress,
-                                                  const gfx::Rect& rect) const {
-  }
+  virtual void PaintScrollbarThumbStateTransition(
+      SkCanvas* canvas,
+      Part part,
+      State startState,
+      State endState,
+      double progress,
+      const gfx::Rect& rect,
+      ScrollbarOverlayColorTheme theme) const {}
 
   // Shrinks checkbox/radio button rect, if necessary, to make room for padding
   // and drop shadow.
   // TODO(mohsen): This is needed because checkboxes/radio buttons on Android
   // have different padding from those on desktop Chrome. Get rid of this when
   // crbug.com/530746 is resolved.
   virtual void AdjustCheckboxRadioRectForPadding(SkRect* rect) const;
 
   void set_scrollbar_button_length(int length) {
     scrollbar_button_length_ = length;
@@ skipping 49 matching lines @@
 
   // The length of the arrow buttons, 0 means no buttons are drawn.
   int scrollbar_button_length_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeBase);
 };
 
 }  // namespace ui
 
 #endif  // UI_NATIVE_THEME_NATIVE_THEME_BASE_H_