Overlay scrollbars flush with window edge

content/child/webthemeengine_impl_default.cc

 // 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.
 
 #include "content/child/webthemeengine_impl_default.h"
 
 #include "build/build_config.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/platform/WebRect.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
@@ skipping 181 matching lines @@
       native_theme_extra_params->progress_bar.value_rect_width =
           extra_params->progressBar.valueRectWidth;
       native_theme_extra_params->progress_bar.value_rect_height =
           extra_params->progressBar.valueRectHeight;
       break;
     case WebThemeEngine::PartScrollbarHorizontalThumb:
     case WebThemeEngine::PartScrollbarVerticalThumb:
       native_theme_extra_params->scrollbar_thumb.scrollbar_theme =
           NativeThemeScrollbarOverlayColorTheme(
               extra_params->scrollbarThumb.scrollbarTheme);
+      native_theme_extra_params->scrollbar_thumb.isVerticalScrollbar =
+          extra_params->scrollbarThumb.isVerticalScrollbar;
+      native_theme_extra_params->scrollbar_thumb.isLeftVerticalScrollbar =
+          extra_params->scrollbarThumb.isLeftVerticalScrollbar;
+      native_theme_extra_params->scrollbar_thumb.hitStart =
+          extra_params->scrollbarThumb.hitStart;
+      native_theme_extra_params->scrollbar_thumb.hitEnd =
+          extra_params->scrollbarThumb.hitEnd;
       break;
     default:
       break;  // Parts that have no extra params get here.
   }
 }
 
 blink::WebSize WebThemeEngineImpl::getSize(WebThemeEngine::Part part) {
   ui::NativeTheme::ExtraParams extra;
   ui::NativeTheme::Part native_theme_part = NativeThemePart(part);
 #if defined(OS_WIN)
@@ skipping 64 matching lines @@
     int32_t vertical_arrow_bitmap_height,
     int32_t horizontal_arrow_bitmap_width) {
   g_vertical_scroll_bar_width = vertical_scroll_bar_width;
   g_horizontal_scroll_bar_height = horizontal_scroll_bar_height;
   g_vertical_arrow_bitmap_height = vertical_arrow_bitmap_height;
   g_horizontal_arrow_bitmap_width = horizontal_arrow_bitmap_width;
 }
 #endif
 
 }  // namespace content