[ash-md] Makes Wi-Fi header row sticky when network list is scrolled

ash/common/system/tray/tray_details_view.cc

Index: ash/common/system/tray/tray_details_view.cc
diff --git a/ash/common/system/tray/tray_details_view.cc b/ash/common/system/tray/tray_details_view.cc
index 70ff14fd6b4feb2838251819af30b34515ef2cf2..20988de3422d3fffb89f36d067d2fb9417b2a7ad 100644
--- a/ash/common/system/tray/tray_details_view.cc
+++ b/ash/common/system/tray/tray_details_view.cc
@@ -6,6 +6,7 @@
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/system/tray/fixed_sized_scroll_view.h"
+#include "ash/common/system/tray/header_list_scroll_view.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "ash/common/system/tray/tray_constants.h"
@@ -65,8 +66,6 @@ class TitleRowSeparatorLayout : public views::LayoutManager {
   }
 };
 
-}  // namespace
-
 class ScrollSeparator : public views::View {
  public:
   ScrollSeparator() {}
@@ -74,17 +73,20 @@ class ScrollSeparator : public views::View {
   ~ScrollSeparator() override {}
 
  private:
-  // Overriden from views::View.
+  // views::View.
   void OnPaint(gfx::Canvas* canvas) override {
-    canvas->FillRect(gfx::Rect(0, height() / 2, width(), 1), kBorderLightColor);
+    canvas->FillRect(gfx::Rect(0, height() / 2, width(), 1),
+                     ash::kBorderLightColor);
   }
   gfx::Size GetPreferredSize() const override {
-    return gfx::Size(1, kTrayPopupScrollSeparatorHeight);
+    return gfx::Size(1, ash::kTrayPopupScrollSeparatorHeight);
   }
 
   DISALLOW_COPY_AND_ASSIGN(ScrollSeparator);
 };
 
+}  // namespace
+
 class ScrollBorder : public views::Border {
  public:
   ScrollBorder() {}
@@ -93,7 +95,7 @@ class ScrollBorder : public views::Border {
   void set_visible(bool visible) { visible_ = visible; }
 
  private:
-  // Overridden from views::Border.
+  // views::Border.
   void Paint(const views::View& view, gfx::Canvas* canvas) override {
     if (!visible_)
       return;
@@ -105,7 +107,7 @@ class ScrollBorder : public views::Border {
 
   gfx::Size GetMinimumSize() const override { return gfx::Size(0, 1); }
 
-  bool visible_;
+  bool visible_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(ScrollBorder);
 };
@@ -181,9 +183,7 @@ void TrayDetailsView::CreateTitleRow(int string_id) {
 
 void TrayDetailsView::CreateScrollableList() {
   DCHECK(!scroller_);
-  scroll_content_ = new views::View;
-  scroll_content_->SetLayoutManager(
-      new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 1));
+  scroll_content_ = new HeaderListScrollView();
   scroller_ = new FixedSizedScrollView;
   scroller_->SetContentsView(scroll_content_);