Use the default theme as the fallback UI in Blink

ui/native_theme/native_theme_aura.cc

Index: ui/native_theme/native_theme_aura.cc
diff --git a/ui/native_theme/native_theme_aura.cc b/ui/native_theme/native_theme_aura.cc
index 8d7ae0ba6d9bfb0fb3d6d1f53419e190d05ec2db..6cbc2554031ba81ce38abe8ef6eae476838e3b4a 100644
--- a/ui/native_theme/native_theme_aura.cc
+++ b/ui/native_theme/native_theme_aura.cc
@@ -19,59 +19,6 @@ namespace {
 
 const SkColor kMenuBackgroundColor = SK_ColorWHITE;
 
-// Theme colors returned by GetSystemColor().
-const SkColor kInvalidColorIdColor = SkColorSetRGB(255, 0, 128);
-// Windows:
-const SkColor kWindowBackgroundColor = SK_ColorWHITE;
-// Dialogs:
-const SkColor kDialogBackgroundColor = SkColorSetRGB(251, 251, 251);
-// FocusableBorder:
-const SkColor kFocusedBorderColor = SkColorSetRGB(0x4D, 0x90, 0xFE);
-const SkColor kUnfocusedBorderColor = SkColorSetRGB(0xD9, 0xD9, 0xD9);
-// Button:
-const SkColor kButtonBackgroundColor = SkColorSetRGB(0xDE, 0xDE, 0xDE);
-const SkColor kButtonEnabledColor = SkColorSetRGB(0x22, 0x22, 0x22);
-const SkColor kButtonDisabledColor = SkColorSetRGB(0x99, 0x99, 0x99);
-const SkColor kButtonHighlightColor = SkColorSetRGB(0, 0, 0);
-const SkColor kButtonHoverColor = kButtonEnabledColor;
-// MenuItem:
-const SkColor kEnabledMenuItemForegroundColor = kButtonEnabledColor;
-const SkColor kDisabledMenuItemForegroundColor = kButtonDisabledColor;
-const SkColor kFocusedMenuItemBackgroundColor = SkColorSetRGB(0xF1, 0xF1, 0xF1);
-const SkColor kHoverMenuItemBackgroundColor =
-    SkColorSetARGB(204, 255, 255, 255);
-const SkColor kMenuSeparatorColor = SkColorSetRGB(0xED, 0xED, 0xED);
-const SkColor kEnabledMenuButtonBorderColor = SkColorSetARGB(36, 0, 0, 0);
-const SkColor kFocusedMenuButtonBorderColor = SkColorSetARGB(72, 0, 0, 0);
-const SkColor kHoverMenuButtonBorderColor = SkColorSetARGB(72, 0, 0, 0);
-// Label:
-const SkColor kLabelEnabledColor = kButtonEnabledColor;
-const SkColor kLabelDisabledColor = kButtonDisabledColor;
-const SkColor kLabelBackgroundColor = SK_ColorWHITE;
-// Textfield:
-const SkColor kTextfieldDefaultColor = SK_ColorBLACK;
-const SkColor kTextfieldDefaultBackground = SK_ColorWHITE;
-const SkColor kTextfieldReadOnlyColor = SK_ColorDKGRAY;
-const SkColor kTextfieldReadOnlyBackground = SK_ColorWHITE;
-const SkColor kTextfieldSelectionBackgroundFocused =
-    SkColorSetARGB(0x54, 0x60, 0xA8, 0xEB);
-const SkColor kTextfieldSelectionBackgroundUnfocused = SK_ColorLTGRAY;
-const SkColor kTextfieldSelectionColor =
-    color_utils::AlphaBlend(SK_ColorBLACK,
-        kTextfieldSelectionBackgroundFocused, 0xdd);
-// Tree
-const SkColor kTreeBackground = SK_ColorWHITE;
-const SkColor kTreeTextColor = SK_ColorBLACK;
-const SkColor kTreeSelectedTextColor = SK_ColorBLACK;
-const SkColor kTreeSelectionBackgroundColor = SkColorSetRGB(0xEE, 0xEE, 0xEE);
-const SkColor kTreeArrowColor = SkColorSetRGB(0x7A, 0x7A, 0x7A);
-// Table
-const SkColor kTableBackground = SK_ColorWHITE;
-const SkColor kTableTextColor = SK_ColorBLACK;
-const SkColor kTableSelectedTextColor = SK_ColorBLACK;
-const SkColor kTableSelectionBackgroundColor = SkColorSetRGB(0xEE, 0xEE, 0xEE);
-const SkColor kTableGroupingIndicatorColor = SkColorSetRGB(0xCC, 0xCC, 0xCC);
-
 }  // namespace
 
 namespace ui {
@@ -95,121 +42,6 @@ NativeThemeAura::NativeThemeAura() {
 NativeThemeAura::~NativeThemeAura() {
 }
 
-SkColor NativeThemeAura::GetSystemColor(ColorId color_id) const {
-  // This implementation returns hardcoded colors.
-  SkColor color;
-  if (CommonThemeGetSystemColor(color_id, &color))
-    return color;
-
-  switch (color_id) {
-    // Windows
-    case kColorId_WindowBackground:
-      return kWindowBackgroundColor;
-
-    // Dialogs
-    case kColorId_DialogBackground:
-      return kDialogBackgroundColor;
-
-    // FocusableBorder
-    case kColorId_FocusedBorderColor:
-      return kFocusedBorderColor;
-    case kColorId_UnfocusedBorderColor:
-      return kUnfocusedBorderColor;
-
-    // Button
-    case kColorId_ButtonBackgroundColor:
-      return kButtonBackgroundColor;
-    case kColorId_ButtonEnabledColor:
-      return kButtonEnabledColor;
-    case kColorId_ButtonDisabledColor:
-      return kButtonDisabledColor;
-    case kColorId_ButtonHighlightColor:
-      return kButtonHighlightColor;
-    case kColorId_ButtonHoverColor:
-      return kButtonHoverColor;
-
-    // MenuItem
-    case kColorId_EnabledMenuItemForegroundColor:
-      return kEnabledMenuItemForegroundColor;
-    case kColorId_DisabledMenuItemForegroundColor:
-      return kDisabledMenuItemForegroundColor;
-    case kColorId_SelectedMenuItemForegroundColor:
-      return kEnabledMenuItemForegroundColor;
-    case kColorId_FocusedMenuItemBackgroundColor:
-      return kFocusedMenuItemBackgroundColor;
-    case kColorId_HoverMenuItemBackgroundColor:
-      return kHoverMenuItemBackgroundColor;
-    case kColorId_MenuSeparatorColor:
-      return kMenuSeparatorColor;
-    case kColorId_EnabledMenuButtonBorderColor:
-      return kEnabledMenuButtonBorderColor;
-    case kColorId_FocusedMenuButtonBorderColor:
-      return kFocusedMenuButtonBorderColor;
-    case kColorId_HoverMenuButtonBorderColor:
-      return kHoverMenuButtonBorderColor;
-
-    // Label
-    case kColorId_LabelEnabledColor:
-      return kLabelEnabledColor;
-    case kColorId_LabelDisabledColor:
-      return kLabelDisabledColor;
-    case kColorId_LabelBackgroundColor:
-      return kLabelBackgroundColor;
-
-    // Textfield
-    case kColorId_TextfieldDefaultColor:
-      return kTextfieldDefaultColor;
-    case kColorId_TextfieldDefaultBackground:
-      return kTextfieldDefaultBackground;
-    case kColorId_TextfieldReadOnlyColor:
-      return kTextfieldReadOnlyColor;
-    case kColorId_TextfieldReadOnlyBackground:
-      return kTextfieldReadOnlyBackground;
-    case kColorId_TextfieldSelectionColor:
-      return kTextfieldSelectionColor;
-    case kColorId_TextfieldSelectionBackgroundFocused:
-      return kTextfieldSelectionBackgroundFocused;
-    case kColorId_TextfieldSelectionBackgroundUnfocused:
-      return kTextfieldSelectionBackgroundUnfocused;
-
-    // Tree
-    case kColorId_TreeBackground:
-      return kTreeBackground;
-    case kColorId_TreeText:
-      return kTreeTextColor;
-    case kColorId_TreeSelectedText:
-    case kColorId_TreeSelectedTextUnfocused:
-      return kTreeSelectedTextColor;
-    case kColorId_TreeSelectionBackgroundFocused:
-    case kColorId_TreeSelectionBackgroundUnfocused:
-      return kTreeSelectionBackgroundColor;
-    case kColorId_TreeArrow:
-      return kTreeArrowColor;
-
-    // Table
-    case kColorId_TableBackground:
-      return kTableBackground;
-    case kColorId_TableText:
-      return kTableTextColor;
-    case kColorId_TableSelectedText:
-    case kColorId_TableSelectedTextUnfocused:
-      return kTableSelectedTextColor;
-    case kColorId_TableSelectionBackgroundFocused:
-    case kColorId_TableSelectionBackgroundUnfocused:
-      return kTableSelectionBackgroundColor;
-    case kColorId_TableGroupingIndicatorColor:
-      return kTableGroupingIndicatorColor;
-
-    case kColorId_MenuBackgroundColor:
-      return kMenuBackgroundColor;
-    case kColorId_MenuBorderColor:
-      NOTREACHED();
-      break;
-  }
-
-  return kInvalidColorIdColor;
-}
-
 void NativeThemeAura::PaintMenuPopupBackground(
     SkCanvas* canvas,
     const gfx::Size& size,