Change Aura overlay scrollbars from solid color to painted scrollbars.

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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/renderer/gpu/render_widget_compositor.h"
 
 #include <stddef.h>
 #include <limits>
 #include <string>
 #include <utility>
@@ skipping 42 matching lines @@
 #include "third_party/WebKit/public/platform/WebCompositeAndReadbackAsyncCallback.h"
 #include "third_party/WebKit/public/platform/WebCompositorMutatorClient.h"
 #include "third_party/WebKit/public/platform/WebLayoutAndPaintAsyncCallback.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "third_party/WebKit/public/web/WebSelection.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/native_theme/native_theme_switches.h"
+#include "ui/native_theme/overlay_scrollbar_constants_aura.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/build_info.h"
 #include "ui/gfx/android/device_display_info.h"
 #endif
 
 namespace base {
 class Value;
 }
 
@@ skipping 340 matching lines @@
   // Webview does not own the surface so should not clear it.
   settings.renderer_settings.should_clear_root_render_pass =
       !using_synchronous_compositor;
 
   // TODO(danakj): Only do this on low end devices.
   settings.create_low_res_tiling = true;
 #else  // defined(OS_ANDROID)
 #if !defined(OS_MACOSX)
   if (ui::IsOverlayScrollbarEnabled()) {
     settings.scrollbar_animator = cc::LayerTreeSettings::THINNING;
-    settings.solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
+    settings.scrollbar_fade_delay_ms = ui::kOverlayScrollbarFadeOutDelayMs;
+    settings.scrollbar_fade_resize_delay_ms =
+        ui::kOverlayScrollbarFadeOutDelayMs;
+    settings.scrollbar_fade_duration_ms =
+        ui::kOverlayScrollbarFadeOutDurationMs;
+    settings.scrollbar_thinning_duration_ms =
+        ui::kOverlayScrollbarThinningDurationMs;
   } else {
+    // TODO(bokan): This section is probably unneeded? We don't use scrollbar
+    // animations for non overlay scrollbars.
     settings.scrollbar_animator = cc::LayerTreeSettings::LINEAR_FADE;
     settings.solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
+    settings.scrollbar_fade_delay_ms = 500;
+    settings.scrollbar_fade_resize_delay_ms = 500;
+    settings.scrollbar_fade_duration_ms = 300;
   }
-  settings.scrollbar_fade_delay_ms = 500;
-  settings.scrollbar_fade_resize_delay_ms = 500;
-  settings.scrollbar_fade_duration_ms = 300;
 #endif  // !defined(OS_MACOSX)
 
   // On desktop, if there's over 4GB of memory on the machine, increase the
   // image decode budget to 256MB for both gpu and software.
   const int kImageDecodeMemoryThresholdMB = 4 * 1024;
   if (base::SysInfo::AmountOfPhysicalMemoryMB() >=
       kImageDecodeMemoryThresholdMB) {
     settings.gpu_decoded_image_budget_bytes = 256 * 1024 * 1024;
     settings.software_decoded_image_budget_bytes = 256 * 1024 * 1024;
   } else {
@@ skipping 676 matching lines @@
     float device_scale) {
   layer_tree_host_->GetLayerTree()->SetPaintedDeviceScaleFactor(device_scale);
 }
 
 void RenderWidgetCompositor::SetDeviceColorSpace(
     const gfx::ColorSpace& color_space) {
   layer_tree_host_->GetLayerTree()->SetDeviceColorSpace(color_space);
 }
 
 }  // namespace content