ui: Make native_theme its own library.

BUG=103304
R=sky@chromium.org


Review URL: https://chromiumcodereview.appspot.com/11275322

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168194 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 1944 insertions, 0 deletions

diff --git a/ui/native_theme/native_theme_win.cc b/ui/native_theme/native_theme_win.cc
new file mode 100644
index 0000000..d83f396
--- /dev/null
+++ b/ui/native_theme/native_theme_win.cc
@@ -0,0 +1,1944 @@
+// 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.
+
+#include "ui/native_theme/native_theme_win.h"
+
+#include <windows.h>
+#include <uxtheme.h>
+#include <vsstyle.h>
+#include <vssym32.h>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/memory/scoped_handle.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/win/scoped_gdi_object.h"
+#include "base/win/scoped_hdc.h"
+#include "base/win/scoped_select_object.h"
+#include "base/win/windows_version.h"
+#include "skia/ext/bitmap_platform_device.h"
+#include "skia/ext/platform_canvas.h"
+#include "skia/ext/skia_utils_win.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColorPriv.h"
+#include "third_party/skia/include/core/SkShader.h"
+#include "ui/gfx/color_utils.h"
+#include "ui/gfx/gdi_util.h"
+#include "ui/gfx/rect.h"
+
+namespace {
+
+// TODO: Obtain the correct colors using GetSysColor.
+// Theme colors returned by GetSystemColor().
+const SkColor kInvalidColorIdColor = SkColorSetRGB(255, 0, 128);
+// Dialogs:
+const SkColor kDialogBackgroundColor = SkColorSetRGB(200, 200, 200);
+// FocusableBorder:
+const SkColor kFocusedBorderColor = SkColorSetRGB(0x4D, 0x90, 0xFE);
+const SkColor kUnfocusedBorderColor = SkColorSetRGB(0xD9, 0xD9, 0xD9);
+// TextButton:
+const SkColor kTextButtonBackgroundColor = SkColorSetRGB(0xde, 0xde, 0xde);
+const SkColor kTextButtonEnabledColor = SkColorSetRGB(6, 45, 117);
+const SkColor kTextButtonDisabledColor = SkColorSetRGB(161, 161, 146);
+const SkColor kTextButtonHighlightColor = SkColorSetARGB(200, 255, 255, 255);
+const SkColor kTextButtonHoverColor = kTextButtonEnabledColor;
+// MenuItem:
+const SkColor kEnabledMenuItemForegroundColor = kTextButtonEnabledColor;
+const SkColor kDisabledMenuItemForegroundColor = kTextButtonDisabledColor;
+const SkColor kFocusedMenuItemBackgroundColor = SkColorSetRGB(246, 249, 253);
+const SkColor kMenuSeparatorColor = SkColorSetARGB(50, 0, 0, 0);
+// Label:
+const SkColor kLabelEnabledColor = color_utils::GetSysSkColor(COLOR_WINDOWTEXT);
+const SkColor kLabelDisabledColor = color_utils::GetSysSkColor(COLOR_GRAYTEXT);
+const SkColor kLabelBackgroundColor = color_utils::GetSysSkColor(COLOR_WINDOW);
+// Textfield:
+const SkColor kTextfieldDefaultColor = SK_ColorBLACK;
+const SkColor kTextfieldDefaultBackground = SK_ColorWHITE;
+const SkColor kTextfieldSelectionColor = SK_ColorWHITE;
+const SkColor kTextfieldSelectionBackgroundFocused =
+    SkColorSetRGB(0x1D, 0x90, 0xFF);
+const SkColor kTextfieldSelectionBackgroundUnfocused = SK_ColorLTGRAY;
+
+SkColor WinColorToSkColor(COLORREF color) {
+  return SkColorSetRGB(GetRValue(color), GetGValue(color), GetBValue(color));
+}
+
+void SetCheckerboardShader(SkPaint* paint, const RECT& align_rect) {
+  // Create a 2x2 checkerboard pattern using the 3D face and highlight colors.
+  SkColor face = skia::COLORREFToSkColor(GetSysColor(COLOR_3DFACE));
+  SkColor highlight = skia::COLORREFToSkColor(GetSysColor(COLOR_3DHILIGHT));
+  SkColor buffer[] = { face, highlight, highlight, face };
+  // Confusing bit: we first create a temporary bitmap with our desired pattern,
+  // then copy it to another bitmap.  The temporary bitmap doesn't take
+  // ownership of the pixel data, and so will point to garbage when this
+  // function returns.  The copy will copy the pixel data into a place owned by
+  // the bitmap, which is in turn owned by the shader, etc., so it will live
+  // until we're done using it.
+  SkBitmap temp_bitmap;
+  temp_bitmap.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
+  temp_bitmap.setPixels(buffer);
+  SkBitmap bitmap;
+  temp_bitmap.copyTo(&bitmap, temp_bitmap.config());
+  SkShader* shader = SkShader::CreateBitmapShader(bitmap,
+                                                  SkShader::kRepeat_TileMode,
+                                                  SkShader::kRepeat_TileMode);
+
+  // Align the pattern with the upper corner of |align_rect|.
+  SkMatrix matrix;
+  matrix.setTranslate(SkIntToScalar(align_rect.left),
+                      SkIntToScalar(align_rect.top));
+  shader->setLocalMatrix(matrix);
+  SkSafeUnref(paint->setShader(shader));
+}
+
+//    <-a->
+// [  *****             ]
+//  ____ |              |
+//  <-a-> <------b----->
+// a: object_width
+// b: frame_width
+// *: animating object
+//
+// - the animation goes from "[" to "]" repeatedly.
+// - the animation offset is at first "|"
+//
+int ComputeAnimationProgress(int frame_width,
+                             int object_width,
+                             int pixels_per_second,
+                             double animated_seconds) {
+  int animation_width = frame_width + object_width;
+  double interval = static_cast<double>(animation_width) / pixels_per_second;
+  double ratio = fmod(animated_seconds, interval) / interval;
+  return static_cast<int>(animation_width * ratio) - object_width;
+}
+
+RECT InsetRect(const RECT* rect, int size) {
+  gfx::Rect result(*rect);
+  result.Inset(size, size);
+  return result.ToRECT();
+}
+
+}  // namespace
+
+namespace ui {
+
+bool NativeThemeWin::IsThemingActive() const {
+  if (is_theme_active_)
+    return !!is_theme_active_();
+  return false;
+}
+
+HRESULT NativeThemeWin::GetThemeColor(ThemeName theme,
+                                      int part_id,
+                                      int state_id,
+                                      int prop_id,
+                                      SkColor* color) const {
+  HANDLE handle = GetThemeHandle(theme);
+  if (handle && get_theme_color_) {
+    COLORREF color_ref;
+    if (get_theme_color_(handle, part_id, state_id, prop_id, &color_ref) ==
+        S_OK) {
+      *color = skia::COLORREFToSkColor(color_ref);
+      return S_OK;
+    }
+  }
+  return E_NOTIMPL;
+}
+
+SkColor NativeThemeWin::GetThemeColorWithDefault(ThemeName theme,
+                                                 int part_id,
+                                                 int state_id,
+                                                 int prop_id,
+                                                 int default_sys_color) const {
+  SkColor color;
+  if (GetThemeColor(theme, part_id, state_id, prop_id, &color) != S_OK)
+    color = skia::COLORREFToSkColor(GetSysColor(default_sys_color));
+  return color;
+}
+
+gfx::Size NativeThemeWin::GetThemeBorderSize(ThemeName theme) const {
+  // For simplicity use the wildcard state==0, part==0, since it works
+  // for the cases we currently depend on.
+  int border;
+  if (GetThemeInt(theme, 0, 0, TMT_BORDERSIZE, &border) == S_OK)
+    return gfx::Size(border, border);
+  else
+    return gfx::Size(GetSystemMetrics(SM_CXEDGE), GetSystemMetrics(SM_CYEDGE));
+}
+
+void NativeThemeWin::DisableTheming() const {
+  if (!set_theme_properties_)
+    return;
+  set_theme_properties_(0);
+}
+
+void NativeThemeWin::CloseHandles() const {
+  if (!close_theme_)
+    return;
+
+  for (int i = 0; i < LAST; ++i) {
+    if (theme_handles_[i]) {
+      close_theme_(theme_handles_[i]);
+      theme_handles_[i] = NULL;
+    }
+  }
+}
+
+bool NativeThemeWin::IsClassicTheme(ThemeName name) const {
+  if (!theme_dll_)
+    return true;
+
+  return !GetThemeHandle(name);
+}
+
+// TODO(sky): seems like we should default to NativeThemeWin, but that currently
+// breaks a couple of tests (FocusTraversalTest.NormalTraversal in
+// views_unittests).
+#if !defined(USE_AURA)
+// static
+NativeTheme* NativeTheme::instance() {
+  return NativeThemeWin::instance();
+}
+#endif
+
+// static
+NativeThemeWin* NativeThemeWin::instance() {
+  CR_DEFINE_STATIC_LOCAL(NativeThemeWin, s_native_theme, ());
+  return &s_native_theme;
+}
+
+gfx::Size NativeThemeWin::GetPartSize(Part part,
+                                      State state,
+                                      const ExtraParams& extra) const {
+  SIZE size;
+  int part_id = GetWindowsPart(part, state, extra);
+  int state_id = GetWindowsState(part, state, extra);
+
+  HDC hdc = GetDC(NULL);
+  HRESULT hr = GetThemePartSize(GetThemeName(part), hdc, part_id, state_id,
+                                NULL, TS_TRUE, &size);
+  ReleaseDC(NULL, hdc);
+
+  if (FAILED(hr)) {
+    // TODO(rogerta): For now, we need to support radio buttons and checkboxes
+    // when theming is not enabled.  Support for other parts can be added
+    // if/when needed.
+    switch (part) {
+      case kCheckbox:
+      case kRadio:
+        // TODO(rogerta): I was not able to find any API to get the default
+        // size of these controls, so determined these values empirically.
+        size.cx = 13;
+        size.cy = 13;
+        break;
+      default:
+        size.cx = 0;
+        size.cy = 0;
+        break;
+    }
+  }
+
+  return gfx::Size(size.cx, size.cy);
+}
+
+void NativeThemeWin::Paint(SkCanvas* canvas,
+                           Part part,
+                           State state,
+                           const gfx::Rect& rect,
+                           const ExtraParams& extra) const {
+  bool needs_paint_indirect = false;
+  if (!skia::SupportsPlatformPaint(canvas)) {
+    // This block will only get hit with --enable-accelerated-drawing flag.
+    needs_paint_indirect = true;
+  } else {
+    // Scrollbars on Windows XP and the Windows Classic theme have particularly
+    // problematic alpha values, so always draw them indirectly.
+    switch (part) {
+      case kScrollbarDownArrow:
+      case kScrollbarUpArrow:
+      case kScrollbarLeftArrow:
+      case kScrollbarRightArrow:
+      case kScrollbarHorizontalThumb:
+      case kScrollbarVerticalThumb:
+      case kScrollbarHorizontalGripper:
+      case kScrollbarVerticalGripper:
+        if (!GetThemeHandle(SCROLLBAR))
+          needs_paint_indirect = true;
+        break;
+      default:
+        break;
+    }
+  }
+
+  if (needs_paint_indirect)
+    PaintIndirect(canvas, part, state, rect, extra);
+  else
+    PaintDirect(canvas, part, state, rect, extra);
+}
+
+NativeThemeWin::NativeThemeWin()
+    : theme_dll_(LoadLibrary(L"uxtheme.dll")),
+      draw_theme_(NULL),
+      draw_theme_ex_(NULL),
+      get_theme_color_(NULL),
+      get_theme_content_rect_(NULL),
+      get_theme_part_size_(NULL),
+      open_theme_(NULL),
+      close_theme_(NULL),
+      set_theme_properties_(NULL),
+      is_theme_active_(NULL),
+      get_theme_int_(NULL) {
+  if (theme_dll_) {
+    draw_theme_ = reinterpret_cast<DrawThemeBackgroundPtr>(
+        GetProcAddress(theme_dll_, "DrawThemeBackground"));
+    draw_theme_ex_ = reinterpret_cast<DrawThemeBackgroundExPtr>(
+        GetProcAddress(theme_dll_, "DrawThemeBackgroundEx"));
+    get_theme_color_ = reinterpret_cast<GetThemeColorPtr>(
+        GetProcAddress(theme_dll_, "GetThemeColor"));
+    get_theme_content_rect_ = reinterpret_cast<GetThemeContentRectPtr>(
+        GetProcAddress(theme_dll_, "GetThemeBackgroundContentRect"));
+    get_theme_part_size_ = reinterpret_cast<GetThemePartSizePtr>(
+        GetProcAddress(theme_dll_, "GetThemePartSize"));
+    open_theme_ = reinterpret_cast<OpenThemeDataPtr>(
+        GetProcAddress(theme_dll_, "OpenThemeData"));
+    close_theme_ = reinterpret_cast<CloseThemeDataPtr>(
+        GetProcAddress(theme_dll_, "CloseThemeData"));
+    set_theme_properties_ = reinterpret_cast<SetThemeAppPropertiesPtr>(
+        GetProcAddress(theme_dll_, "SetThemeAppProperties"));
+    is_theme_active_ = reinterpret_cast<IsThemeActivePtr>(
+        GetProcAddress(theme_dll_, "IsThemeActive"));
+    get_theme_int_ = reinterpret_cast<GetThemeIntPtr>(
+        GetProcAddress(theme_dll_, "GetThemeInt"));
+  }
+  memset(theme_handles_, 0, sizeof(theme_handles_));
+}
+
+NativeThemeWin::~NativeThemeWin() {
+  if (theme_dll_) {
+    // todo (cpu): fix this soon.  Making a call to CloseHandles() here breaks
+    // certain tests and the reliability bots.
+    // CloseHandles();
+    FreeLibrary(theme_dll_);
+  }
+}
+
+void NativeThemeWin::PaintDirect(SkCanvas* canvas,
+                                 Part part,
+                                 State state,
+                                 const gfx::Rect& rect,
+                                 const ExtraParams& extra) const {
+  skia::ScopedPlatformPaint scoped_platform_paint(canvas);
+  HDC hdc = scoped_platform_paint.GetPlatformSurface();
+
+  switch (part) {
+    case kCheckbox:
+      PaintCheckbox(hdc, part, state, rect, extra.button);
+      break;
+    case kRadio:
+      PaintRadioButton(hdc, part, state, rect, extra.button);
+      break;
+    case kPushButton:
+      PaintPushButton(hdc, part, state, rect, extra.button);
+      break;
+    case kMenuPopupArrow:
+      PaintMenuArrow(hdc, state, rect, extra.menu_arrow);
+      break;
+    case kMenuPopupGutter:
+      PaintMenuGutter(hdc, rect);
+      break;
+    case kMenuPopupSeparator:
+      PaintMenuSeparator(hdc, rect, extra.menu_separator);
+      break;
+    case kMenuPopupBackground:
+      PaintMenuBackground(hdc, rect);
+      break;
+    case kMenuCheck:
+      PaintMenuCheck(hdc, state, rect, extra.menu_check);
+      break;
+    case kMenuCheckBackground:
+      PaintMenuCheckBackground(hdc, state, rect);
+      break;
+    case kMenuItemBackground:
+      PaintMenuItemBackground(hdc, state, rect, extra.menu_item);
+      break;
+    case kMenuList:
+      PaintMenuList(hdc, state, rect, extra.menu_list);
+      break;
+    case kScrollbarDownArrow:
+    case kScrollbarUpArrow:
+    case kScrollbarLeftArrow:
+    case kScrollbarRightArrow:
+      PaintScrollbarArrow(hdc, part, state, rect, extra.scrollbar_arrow);
+      break;
+    case kScrollbarHorizontalTrack:
+    case kScrollbarVerticalTrack:
+      PaintScrollbarTrack(canvas, hdc, part, state, rect,
+                          extra.scrollbar_track);
+      break;
+    case kScrollbarHorizontalThumb:
+    case kScrollbarVerticalThumb:
+    case kScrollbarHorizontalGripper:
+    case kScrollbarVerticalGripper:
+      PaintScrollbarThumb(hdc, part, state, rect, extra.scrollbar_thumb);
+      break;
+    case kInnerSpinButton:
+      PaintSpinButton(hdc, part, state, rect, extra.inner_spin);
+      break;
+    case kTrackbarThumb:
+    case kTrackbarTrack:
+      PaintTrackbar(canvas, hdc, part, state, rect, extra.trackbar);
+      break;
+    case kProgressBar:
+      PaintProgressBar(hdc, rect, extra.progress_bar);
+      break;
+    case kWindowResizeGripper:
+      PaintWindowResizeGripper(hdc, rect);
+      break;
+    case kTabPanelBackground:
+      PaintTabPanelBackground(hdc, rect);
+      break;
+    case kTextField:
+      PaintTextField(hdc, part, state, rect, extra.text_field);
+      break;
+
+    case kSliderTrack:
+    case kSliderThumb:
+    default:
+      // While transitioning NativeThemeWin to the single Paint() entry point,
+      // unsupported parts will DCHECK here.
+      NOTREACHED();
+  }
+}
+
+SkColor NativeThemeWin::GetSystemColor(ColorId color_id) const {
+  switch (color_id) {
+
+    // Dialogs
+    case kColorId_DialogBackground:
+      // TODO(benrg): Should this use the new Windows theme functions? The old
+      // code in DialogClientView::OnPaint used GetSysColor(COLOR_3DFACE).
+      return WinColorToSkColor(GetSysColor(COLOR_3DFACE));
+
+    // FocusableBorder
+    case kColorId_FocusedBorderColor:
+      return kFocusedBorderColor;
+    case kColorId_UnfocusedBorderColor:
+      return kUnfocusedBorderColor;
+
+    // TextButton
+    case kColorId_TextButtonBackgroundColor:
+      return kTextButtonBackgroundColor;
+    case kColorId_TextButtonEnabledColor:
+      return kTextButtonEnabledColor;
+    case kColorId_TextButtonDisabledColor:
+      return kTextButtonDisabledColor;
+    case kColorId_TextButtonHighlightColor:
+      return kTextButtonHighlightColor;
+    case kColorId_TextButtonHoverColor:
+      return kTextButtonHoverColor;
+
+    // MenuItem
+    case kColorId_EnabledMenuItemForegroundColor:
+      return kEnabledMenuItemForegroundColor;
+    case kColorId_DisabledMenuItemForegroundColor:
+      return kDisabledMenuItemForegroundColor;
+    case kColorId_FocusedMenuItemBackgroundColor:
+      return kFocusedMenuItemBackgroundColor;
+    case kColorId_MenuSeparatorColor:
+      return kMenuSeparatorColor;
+
+    // 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_TextfieldSelectionColor:
+      return kTextfieldSelectionColor;
+    case kColorId_TextfieldSelectionBackgroundFocused:
+      return kTextfieldSelectionBackgroundFocused;
+    case kColorId_TextfieldSelectionBackgroundUnfocused:
+      return kTextfieldSelectionBackgroundUnfocused;
+
+    default:
+      NOTREACHED() << "Invalid color_id: " << color_id;
+      break;
+  }
+  return kInvalidColorIdColor;
+}
+
+void NativeThemeWin::PaintIndirect(SkCanvas* canvas,
+                                   Part part,
+                                   State state,
+                                   const gfx::Rect& rect,
+                                   const ExtraParams& extra) const {
+  // TODO(asvitkine): This path is pretty inefficient - for each paint operation
+  //                  it creates a new offscreen bitmap Skia canvas. This can
+  //                  be sped up by doing it only once per part/state and
+  //                  keeping a cache of the resulting bitmaps.
+
+  // Create an offscreen canvas that is backed by an HDC.
+  skia::BitmapPlatformDevice* device = skia::BitmapPlatformDevice::Create(
+      rect.width(), rect.height(), false, NULL);
+  DCHECK(device);
+  SkCanvas offscreen_canvas(device);
+  device->unref();
+  DCHECK(skia::SupportsPlatformPaint(&offscreen_canvas));
+
+  // Some of the Windows theme drawing operations do not write correct alpha
+  // values for fully-opaque pixels; instead the pixels get alpha 0. This is
+  // especially a problem on Windows XP or when using the Classic theme.
+  //
+  // To work-around this, mark all pixels with a placeholder value, to detect
+  // which pixels get touched by the paint operation. After paint, set any
+  // pixels that have alpha 0 to opaque and placeholders to fully-transparent.
+  const SkColor placeholder = SkColorSetARGB(1, 0, 0, 0);
+  offscreen_canvas.clear(placeholder);
+
+  // Offset destination rects to have origin (0,0).
+  gfx::Rect adjusted_rect(rect.size());
+  ExtraParams adjusted_extra(extra);
+  switch (part) {
+    case kProgressBar:
+      adjusted_extra.progress_bar.value_rect_x = 0;
+      adjusted_extra.progress_bar.value_rect_y = 0;
+      break;
+    case kScrollbarHorizontalTrack:
+    case kScrollbarVerticalTrack:
+      adjusted_extra.scrollbar_track.track_x = 0;
+      adjusted_extra.scrollbar_track.track_y = 0;
+      break;
+    default: break;
+  }
+  // Draw the theme controls using existing HDC-drawing code.
+  PaintDirect(&offscreen_canvas,
+              part,
+              state,
+              adjusted_rect,
+              adjusted_extra);
+
+  // Copy the pixels to a bitmap that has ref-counted pixel storage, which is
+  // necessary to have when drawing to a SkPicture.
+  const SkBitmap& hdc_bitmap =
+      offscreen_canvas.getDevice()->accessBitmap(false);
+  SkBitmap bitmap;
+  hdc_bitmap.copyTo(&bitmap, SkBitmap::kARGB_8888_Config);
+
+  // Post-process the pixels to fix up the alpha values (see big comment above).
+  const SkPMColor placeholder_value = SkPreMultiplyColor(placeholder);
+  const int pixel_count = rect.width() * rect.height();
+  SkPMColor* pixels = bitmap.getAddr32(0, 0);
+  for (int i = 0; i < pixel_count; i++) {
+    if (pixels[i] == placeholder_value) {
+      // Pixel wasn't touched - make it fully transparent.
+      pixels[i] = SkPackARGB32(0, 0, 0, 0);
+    } else if (SkGetPackedA32(pixels[i]) == 0) {
+      // Pixel was touched but has incorrect alpha of 0, make it fully opaque.
+      pixels[i] = SkPackARGB32(0xFF,
+                               SkGetPackedR32(pixels[i]),
+                               SkGetPackedG32(pixels[i]),
+                               SkGetPackedB32(pixels[i]));
+    }
+  }
+
+  // Draw the offscreen bitmap to the destination canvas.
+  canvas->drawBitmap(bitmap, rect.x(), rect.y());
+}
+
+HRESULT NativeThemeWin::GetThemePartSize(ThemeName theme_name,
+                                         HDC hdc,
+                                         int part_id,
+                                         int state_id,
+                                         RECT* rect,
+                                         int ts,
+                                         SIZE* size) const {
+  HANDLE handle = GetThemeHandle(theme_name);
+  if (handle && get_theme_part_size_)
+    return get_theme_part_size_(handle, hdc, part_id, state_id, rect, ts, size);
+
+  return E_NOTIMPL;
+}
+
+HRESULT NativeThemeWin::PaintButton(HDC hdc,
+                                    State state,
+                                    const ButtonExtraParams& extra,
+                                    int part_id,
+                                    int state_id,
+                                    RECT* rect) const {
+  HANDLE handle = GetThemeHandle(BUTTON);
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, part_id, state_id, rect, NULL);
+
+  // Adjust classic_state based on part, state, and extras.
+  int classic_state = extra.classic_state;
+  switch (part_id) {
+    case BP_CHECKBOX:
+      classic_state |= DFCS_BUTTONCHECK;
+      break;
+    case BP_RADIOBUTTON:
+      classic_state |= DFCS_BUTTONRADIO;
+      break;
+    case BP_PUSHBUTTON:
+      classic_state |= DFCS_BUTTONPUSH;
+      break;
+    default:
+      NOTREACHED() << "Unknown part_id: " << part_id;
+      break;
+  }
+
+  switch (state) {
+    case kDisabled:
+      classic_state |= DFCS_INACTIVE;
+      break;
+    case kPressed:
+      classic_state |= DFCS_PUSHED;
+      break;
+    case kNormal:
+    case kHovered:
+      break;
+    default:
+      NOTREACHED() << "Unknown state: " << state;
+      break;
+  }
+
+  if (extra.checked)
+    classic_state |= DFCS_CHECKED;
+
+  // Draw it manually.
+  // All pressed states have both low bits set, and no other states do.
+  const bool focused = ((state_id & ETS_FOCUSED) == ETS_FOCUSED);
+  const bool pressed = ((state_id & PBS_PRESSED) == PBS_PRESSED);
+  if ((BP_PUSHBUTTON == part_id) && (pressed || focused)) {
+    // BP_PUSHBUTTON has a focus rect drawn around the outer edge, and the
+    // button itself is shrunk by 1 pixel.
+    HBRUSH brush = GetSysColorBrush(COLOR_3DDKSHADOW);
+    if (brush) {
+      FrameRect(hdc, rect, brush);
+      InflateRect(rect, -1, -1);
+    }
+  }
+  DrawFrameControl(hdc, rect, DFC_BUTTON, classic_state);
+
+  // Draw the focus rectangle (the dotted line box) only on buttons.  For radio
+  // and checkboxes, we let webkit draw the focus rectangle (orange glow).
+  if ((BP_PUSHBUTTON == part_id) && focused) {
+    // The focus rect is inside the button.  The exact number of pixels depends
+    // on whether we're in classic mode or using uxtheme.
+    if (handle && get_theme_content_rect_) {
+      get_theme_content_rect_(handle, hdc, part_id, state_id, rect, rect);
+    } else {
+      InflateRect(rect, -GetSystemMetrics(SM_CXEDGE),
+                  -GetSystemMetrics(SM_CYEDGE));
+    }
+    DrawFocusRect(hdc, rect);
+  }
+
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintMenuSeparator(
+    HDC hdc,
+    const gfx::Rect& rect,
+    const MenuSeparatorExtraParams& extra) const {
+  RECT rect_win = rect.ToRECT();
+
+  HANDLE handle = GetThemeHandle(MENU);
+  if (handle && draw_theme_) {
+    // Delta is needed for non-classic to move separator up slightly.
+    --rect_win.top;
+    --rect_win.bottom;
+    return draw_theme_(handle, hdc, MENU_POPUPSEPARATOR, MPI_NORMAL, &rect_win,
+                       NULL);
+  }
+
+  DrawEdge(hdc, &rect_win, EDGE_ETCHED, BF_TOP);
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintMenuGutter(HDC hdc,
+                                        const gfx::Rect& rect) const {
+  RECT rect_win = rect.ToRECT();
+  HANDLE handle = GetThemeHandle(MENU);
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, MENU_POPUPGUTTER, MPI_NORMAL, &rect_win,
+                       NULL);
+  return E_NOTIMPL;
+}
+
+HRESULT NativeThemeWin::PaintMenuArrow(HDC hdc,
+                                       State state,
+                                       const gfx::Rect& rect,
+                                       const MenuArrowExtraParams& extra)
+    const {
+  int state_id = MSM_NORMAL;
+  if (state == kDisabled)
+    state_id = MSM_DISABLED;
+
+  HANDLE handle = GetThemeHandle(MENU);
+  RECT rect_win = rect.ToRECT();
+  if (handle && draw_theme_) {
+    if (extra.pointing_right) {
+      return draw_theme_(handle, hdc, MENU_POPUPSUBMENU, state_id, &rect_win,
+                         NULL);
+    } else {
+      // There is no way to tell the uxtheme API to draw a left pointing arrow;
+      // it doesn't have a flag equivalent to DFCS_MENUARROWRIGHT.  But they
+      // are needed for RTL locales on Vista.  So use a memory DC and mirror
+      // the region with GDI's StretchBlt.
+      gfx::Rect r(rect);
+      base::win::ScopedCreateDC mem_dc(CreateCompatibleDC(hdc));
+      base::win::ScopedBitmap mem_bitmap(CreateCompatibleBitmap(hdc, r.width(),
+                                                                r.height()));
+      base::win::ScopedSelectObject select_bitmap(mem_dc, mem_bitmap);
+      // Copy and horizontally mirror the background from hdc into mem_dc. Use
+      // a negative-width source rect, starting at the rightmost pixel.
+      StretchBlt(mem_dc, 0, 0, r.width(), r.height(),
+                 hdc, r.right()-1, r.y(), -r.width(), r.height(), SRCCOPY);
+      // Draw the arrow.
+      RECT theme_rect = {0, 0, r.width(), r.height()};
+      HRESULT result = draw_theme_(handle, mem_dc, MENU_POPUPSUBMENU,
+                                   state_id, &theme_rect, NULL);
+      // Copy and mirror the result back into mem_dc.
+      StretchBlt(hdc, r.x(), r.y(), r.width(), r.height(),
+                 mem_dc, r.width()-1, 0, -r.width(), r.height(), SRCCOPY);
+      return result;
+    }
+  }
+
+  // For some reason, Windows uses the name DFCS_MENUARROWRIGHT to indicate a
+  // left pointing arrow. This makes the following 'if' statement slightly
+  // counterintuitive.
+  UINT pfc_state;
+  if (extra.pointing_right)
+    pfc_state = DFCS_MENUARROW;
+  else
+    pfc_state = DFCS_MENUARROWRIGHT;
+  return PaintFrameControl(hdc, rect, DFC_MENU, pfc_state, extra.is_selected,
+                           state);
+}
+
+HRESULT NativeThemeWin::PaintMenuBackground(HDC hdc,
+                                            const gfx::Rect& rect) const {
+  HANDLE handle = GetThemeHandle(MENU);
+  RECT rect_win = rect.ToRECT();
+  if (handle && draw_theme_) {
+    HRESULT result = draw_theme_(handle, hdc, MENU_POPUPBACKGROUND, 0,
+                                 &rect_win, NULL);
+    FrameRect(hdc, &rect_win, GetSysColorBrush(COLOR_3DSHADOW));
+    return result;
+  }
+
+  FillRect(hdc, &rect_win, GetSysColorBrush(COLOR_MENU));
+  DrawEdge(hdc, &rect_win, EDGE_RAISED, BF_RECT);
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintMenuCheck(
+    HDC hdc,
+    State state,
+    const gfx::Rect& rect,
+    const MenuCheckExtraParams& extra) const {
+  HANDLE handle = GetThemeHandle(MENU);
+  int state_id;
+  if (extra.is_radio) {
+    state_id = state == kDisabled ? MC_BULLETDISABLED : MC_BULLETNORMAL;
+  } else {
+    state_id = state == kDisabled ? MC_CHECKMARKDISABLED : MC_CHECKMARKNORMAL;
+  }
+
+  RECT rect_win = rect.ToRECT();
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, MENU_POPUPCHECK, state_id, &rect_win, NULL);
+
+  return PaintFrameControl(hdc, rect, DFC_MENU,
+                           extra.is_radio ? DFCS_MENUBULLET : DFCS_MENUCHECK,
+                           extra.is_selected, state);
+}
+
+HRESULT NativeThemeWin::PaintMenuCheckBackground(HDC hdc,
+                                                 State state,
+                                                 const gfx::Rect& rect) const {
+  HANDLE handle = GetThemeHandle(MENU);
+  int state_id = state == kDisabled ? MCB_DISABLED : MCB_NORMAL;
+  RECT rect_win = rect.ToRECT();
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, MENU_POPUPCHECKBACKGROUND, state_id,
+                       &rect_win, NULL);
+  // Nothing to do for background.
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintMenuItemBackground(
+    HDC hdc,
+    State state,
+    const gfx::Rect& rect,
+    const MenuItemExtraParams& extra) const {
+  HANDLE handle = GetThemeHandle(MENU);
+  RECT rect_win = rect.ToRECT();
+  int state_id;
+  switch (state) {
+    case kNormal:
+      state_id = MPI_NORMAL;
+      break;
+    case kDisabled:
+      state_id = extra.is_selected ? MPI_DISABLEDHOT : MPI_DISABLED;
+      break;
+    case kHovered:
+      state_id = MPI_HOT;
+      break;
+    default:
+      NOTREACHED() << "Invalid state " << state;
+      break;
+  }
+
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, MENU_POPUPITEM, state_id, &rect_win, NULL);
+
+  if (extra.is_selected)
+    FillRect(hdc, &rect_win, GetSysColorBrush(COLOR_HIGHLIGHT));
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintPushButton(HDC hdc,
+                                        Part part,
+                                        State state,
+                                        const gfx::Rect& rect,
+                                        const ButtonExtraParams& extra) const {
+  int state_id;
+  switch (state) {
+    case kDisabled:
+      state_id = PBS_DISABLED;
+      break;
+    case kHovered:
+      state_id = PBS_HOT;
+      break;
+    case kNormal:
+      state_id = extra.is_default ? PBS_DEFAULTED : PBS_NORMAL;
+      break;
+    case kPressed:
+      state_id = PBS_PRESSED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
+
+  RECT rect_win = rect.ToRECT();
+  return PaintButton(hdc, state, extra, BP_PUSHBUTTON, state_id, &rect_win);
+}
+
+HRESULT NativeThemeWin::PaintRadioButton(HDC hdc,
+                                         Part part,
+                                         State state,
+                                         const gfx::Rect& rect,
+                                         const ButtonExtraParams& extra) const {
+  int state_id;
+  switch (state) {
+    case kDisabled:
+      state_id = extra.checked ? RBS_CHECKEDDISABLED : RBS_UNCHECKEDDISABLED;
+      break;
+    case kHovered:
+      state_id = extra.checked ? RBS_CHECKEDHOT : RBS_UNCHECKEDHOT;
+      break;
+    case kNormal:
+      state_id = extra.checked ? RBS_CHECKEDNORMAL : RBS_UNCHECKEDNORMAL;
+      break;
+    case kPressed:
+      state_id = extra.checked ? RBS_CHECKEDPRESSED : RBS_UNCHECKEDPRESSED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
+
+  RECT rect_win = rect.ToRECT();
+  return PaintButton(hdc, state, extra, BP_RADIOBUTTON, state_id, &rect_win);
+}
+
+HRESULT NativeThemeWin::PaintCheckbox(HDC hdc,
+                                      Part part,
+                                      State state,
+                                      const gfx::Rect& rect,
+                                      const ButtonExtraParams& extra) const {
+  int state_id;
+  switch (state) {
+    case kDisabled:
+      state_id = extra.checked ? CBS_CHECKEDDISABLED :
+          extra.indeterminate ? CBS_MIXEDDISABLED :
+              CBS_UNCHECKEDDISABLED;
+      break;
+    case kHovered:
+      state_id = extra.checked ? CBS_CHECKEDHOT :
+          extra.indeterminate ? CBS_MIXEDHOT :
+              CBS_UNCHECKEDHOT;
+      break;
+    case kNormal:
+      state_id = extra.checked ? CBS_CHECKEDNORMAL :
+          extra.indeterminate ? CBS_MIXEDNORMAL :
+              CBS_UNCHECKEDNORMAL;
+      break;
+    case kPressed:
+      state_id = extra.checked ? CBS_CHECKEDPRESSED :
+          extra.indeterminate ? CBS_MIXEDPRESSED :
+              CBS_UNCHECKEDPRESSED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
+
+  RECT rect_win = rect.ToRECT();
+  return PaintButton(hdc, state, extra, BP_CHECKBOX, state_id, &rect_win);
+}
+
+HRESULT NativeThemeWin::PaintMenuList(HDC hdc,
+                                      State state,
+                                      const gfx::Rect& rect,
+                                      const MenuListExtraParams& extra) const {
+  HANDLE handle = GetThemeHandle(MENULIST);
+  RECT rect_win = rect.ToRECT();
+  int state_id;
+  switch (state) {
+    case kNormal:
+      state_id = CBXS_NORMAL;
+      break;
+    case kDisabled:
+      state_id = CBXS_DISABLED;
+      break;
+    case kHovered:
+      state_id = CBXS_HOT;
+      break;
+    case kPressed:
+      state_id = CBXS_PRESSED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state " << state;
+      break;
+  }
+
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, CP_DROPDOWNBUTTON, state_id, &rect_win,
+                       NULL);
+
+  // Draw it manually.
+  DrawFrameControl(hdc, &rect_win, DFC_SCROLL,
+                   DFCS_SCROLLCOMBOBOX | extra.classic_state);
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintScrollbarArrow(
+    HDC hdc,
+    Part part,
+    State state,
+    const gfx::Rect& rect,
+    const ScrollbarArrowExtraParams& extra) const {
+  static const int state_id_matrix[4][kMaxState] = {
+      ABS_DOWNDISABLED, ABS_DOWNHOT, ABS_DOWNNORMAL, ABS_DOWNPRESSED,
+      ABS_LEFTDISABLED, ABS_LEFTHOT, ABS_LEFTNORMAL, ABS_LEFTPRESSED,
+      ABS_RIGHTDISABLED, ABS_RIGHTHOT, ABS_RIGHTNORMAL, ABS_RIGHTPRESSED,
+      ABS_UPDISABLED, ABS_UPHOT, ABS_UPNORMAL, ABS_UPPRESSED
+  };
+  HANDLE handle = GetThemeHandle(SCROLLBAR);
+  RECT rect_win = rect.ToRECT();
+  if (handle && draw_theme_) {
+    int index = part - kScrollbarDownArrow;
+    DCHECK(index >=0 && index < 4);
+    int state_id = state_id_matrix[index][state];
+
+    // Hovering means that the cursor is over the scroolbar, but not over the
+    // specific arrow itself.  We don't want to show it "hot" mode, but only
+    // in "hover" mode.
+    if (state == kHovered && extra.is_hovering) {
+      switch (part) {
+        case kScrollbarDownArrow:
+          state_id = ABS_DOWNHOVER;
+          break;
+        case kScrollbarLeftArrow:
+          state_id = ABS_LEFTHOVER;
+          break;
+        case kScrollbarRightArrow:
+          state_id = ABS_RIGHTHOVER;
+          break;
+        case kScrollbarUpArrow:
+          state_id = ABS_UPHOVER;
+          break;
+        default:
+          NOTREACHED() << "Invalid part: " << part;
+          break;
+      }
+    }
+
+    return draw_theme_(handle, hdc, SBP_ARROWBTN, state_id, &rect_win, NULL);
+  }
+
+  int classic_state = DFCS_SCROLLDOWN;
+  switch (part) {
+    case kScrollbarDownArrow:
+      classic_state = DFCS_SCROLLDOWN;
+      break;
+    case kScrollbarLeftArrow:
+      classic_state = DFCS_SCROLLLEFT;
+      break;
+    case kScrollbarRightArrow:
+      classic_state = DFCS_SCROLLRIGHT;
+      break;
+    case kScrollbarUpArrow:
+      classic_state = DFCS_SCROLLUP;
+      break;
+    default:
+      NOTREACHED() << "Invalid part: " << part;
+      break;
+  }
+  switch (state) {
+    case kDisabled:
+      classic_state |= DFCS_INACTIVE;
+      break;
+    case kHovered:
+      classic_state |= DFCS_HOT;
+      break;
+    case kNormal:
+      break;
+    case kPressed:
+      classic_state |= DFCS_PUSHED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
+  DrawFrameControl(hdc, &rect_win, DFC_SCROLL, classic_state);
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintScrollbarThumb(
+    HDC hdc,
+    Part part,
+    State state,
+    const gfx::Rect& rect,
+    const ScrollbarThumbExtraParams& extra) const {
+  HANDLE handle = GetThemeHandle(SCROLLBAR);
+  RECT rect_win = rect.ToRECT();
+  int part_id;
+  int state_id;
+
+  switch (part) {
+    case NativeTheme::kScrollbarHorizontalThumb:
+      part_id = SBP_THUMBBTNHORZ;
+      break;
+    case NativeTheme::kScrollbarVerticalThumb:
+      part_id = SBP_THUMBBTNVERT;
+      break;
+    case NativeTheme::kScrollbarHorizontalGripper:
+      part_id = SBP_GRIPPERHORZ;
+      break;
+    case NativeTheme::kScrollbarVerticalGripper:
+      part_id = SBP_GRIPPERVERT;
+      break;
+    default:
+      NOTREACHED() << "Invalid part: " << part;
+      break;
+  }
+
+  switch (state) {
+    case kDisabled:
+      state_id = SCRBS_DISABLED;
+      break;
+    case kHovered:
+      state_id = extra.is_hovering ? SCRBS_HOVER : SCRBS_HOT;
+      break;
+    case kNormal:
+      state_id = SCRBS_NORMAL;
+      break;
+    case kPressed:
+      state_id = SCRBS_PRESSED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
+
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, part_id, state_id, &rect_win, NULL);
+
+  // Draw it manually.
+  if ((part_id == SBP_THUMBBTNHORZ) || (part_id == SBP_THUMBBTNVERT))
+    DrawEdge(hdc, &rect_win, EDGE_RAISED, BF_RECT | BF_MIDDLE);
+  // Classic mode doesn't have a gripper.
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintScrollbarTrack(
+    SkCanvas* canvas,
+    HDC hdc,
+    Part part,
+    State state,
+    const gfx::Rect& rect,
+    const ScrollbarTrackExtraParams& extra) const {
+  HANDLE handle = GetThemeHandle(SCROLLBAR);
+  RECT rect_win = rect.ToRECT();
+  int part_id;
+  int state_id;
+
+  switch (part) {
+    case NativeTheme::kScrollbarHorizontalTrack:
+      part_id = extra.is_upper ? SBP_UPPERTRACKHORZ : SBP_LOWERTRACKHORZ;
+      break;
+    case NativeTheme::kScrollbarVerticalTrack:
+      part_id = extra.is_upper ? SBP_UPPERTRACKVERT : SBP_LOWERTRACKVERT;
+      break;
+    default:
+      NOTREACHED() << "Invalid part: " << part;
+      break;
+  }
+
+  switch (state) {
+    case kDisabled:
+      state_id = SCRBS_DISABLED;
+      break;
+    case kHovered:
+      state_id = SCRBS_HOVER;
+      break;
+    case kNormal:
+      state_id = SCRBS_NORMAL;
+      break;
+    case kPressed:
+      state_id = SCRBS_PRESSED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
+
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, part_id, state_id, &rect_win, NULL);
+
+  // Draw it manually.
+  const DWORD colorScrollbar = GetSysColor(COLOR_SCROLLBAR);
+  const DWORD color3DFace = GetSysColor(COLOR_3DFACE);
+  if ((colorScrollbar != color3DFace) &&
+      (colorScrollbar != GetSysColor(COLOR_WINDOW))) {
+    FillRect(hdc, &rect_win, reinterpret_cast<HBRUSH>(COLOR_SCROLLBAR + 1));
+  } else {
+    SkPaint paint;
+    RECT align_rect = gfx::Rect(extra.track_x, extra.track_y, extra.track_width,
+                                extra.track_height).ToRECT();
+    SetCheckerboardShader(&paint, align_rect);
+    canvas->drawIRect(skia::RECTToSkIRect(rect_win), paint);
+  }
+  if (extra.classic_state & DFCS_PUSHED)
+    InvertRect(hdc, &rect_win);
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintSpinButton(
+    HDC hdc,
+    Part part,
+    State state,
+    const gfx::Rect& rect,
+    const InnerSpinButtonExtraParams& extra) const {
+  HANDLE handle = GetThemeHandle(SPIN);
+  RECT rect_win = rect.ToRECT();
+  int part_id = extra.spin_up ? SPNP_UP : SPNP_DOWN;
+  int state_id;
+  switch (state) {
+    case kDisabled:
+      state_id = extra.spin_up ? UPS_DISABLED : DNS_DISABLED;
+      break;
+    case kHovered:
+      state_id = extra.spin_up ? UPS_HOT : DNS_HOT;
+      break;
+    case kNormal:
+      state_id = extra.spin_up ? UPS_NORMAL : DNS_NORMAL;
+      break;
+    case kPressed:
+      state_id = extra.spin_up ? UPS_PRESSED : DNS_PRESSED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state " << state;
+      break;
+  }
+
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, part_id, state_id, &rect_win, NULL);
+  DrawFrameControl(hdc, &rect_win, DFC_SCROLL, extra.classic_state);
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintTrackbar(
+    SkCanvas* canvas,
+    HDC hdc,
+    Part part,
+    State state,
+    const gfx::Rect& rect,
+    const TrackbarExtraParams& extra) const {
+  int part_id = part == kTrackbarTrack ? TKP_TRACK : TKP_THUMBBOTTOM;
+  if (extra.vertical)
+    part_id = part == kTrackbarTrack ? TKP_TRACKVERT : TKP_THUMBVERT;
+
+  int state_id = 0;
+  switch (state) {
+    case kDisabled:
+      state_id = TUS_DISABLED;
+      break;
+    case kHovered:
+      state_id = TUS_HOT;
+      break;
+    case kNormal:
+      state_id = TUS_NORMAL;
+      break;
+    case kPressed:
+      state_id = TUS_PRESSED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state " << state;
+      break;
+  }
+
+  // Make the channel be 4 px thick in the center of the supplied rect.  (4 px
+  // matches what XP does in various menus; GetThemePartSize() doesn't seem to
+  // return good values here.)
+  RECT rect_win = rect.ToRECT();
+  RECT channel_rect = rect.ToRECT();
+  const int channel_thickness = 4;
+  if (part_id == TKP_TRACK) {
+    channel_rect.top +=
+        ((channel_rect.bottom - channel_rect.top - channel_thickness) / 2);
+    channel_rect.bottom = channel_rect.top + channel_thickness;
+  } else if (part_id == TKP_TRACKVERT) {
+    channel_rect.left +=
+        ((channel_rect.right - channel_rect.left - channel_thickness) / 2);
+    channel_rect.right = channel_rect.left + channel_thickness;
+  }  // else this isn't actually a channel, so |channel_rect| == |rect|.
+
+  HANDLE handle = GetThemeHandle(TRACKBAR);
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, part_id, state_id, &channel_rect, NULL);
+
+  // Classic mode, draw it manually.
+  if ((part_id == TKP_TRACK) || (part_id == TKP_TRACKVERT)) {
+    DrawEdge(hdc, &channel_rect, EDGE_SUNKEN, BF_RECT);
+  } else if (part_id == TKP_THUMBVERT) {
+    DrawEdge(hdc, &rect_win, EDGE_RAISED, BF_RECT | BF_SOFT | BF_MIDDLE);
+  } else {
+    // Split rect into top and bottom pieces.
+    RECT top_section = rect.ToRECT();
+    RECT bottom_section = rect.ToRECT();
+    top_section.bottom -= ((bottom_section.right - bottom_section.left) / 2);
+    bottom_section.top = top_section.bottom;
+    DrawEdge(hdc, &top_section, EDGE_RAISED,
+             BF_LEFT | BF_TOP | BF_RIGHT | BF_SOFT | BF_MIDDLE | BF_ADJUST);
+
+    // Split triangular piece into two diagonals.
+    RECT& left_half = bottom_section;
+    RECT right_half = bottom_section;
+    right_half.left += ((bottom_section.right - bottom_section.left) / 2);
+    left_half.right = right_half.left;
+    DrawEdge(hdc, &left_half, EDGE_RAISED,
+             BF_DIAGONAL_ENDTOPLEFT | BF_SOFT | BF_MIDDLE | BF_ADJUST);
+    DrawEdge(hdc, &right_half, EDGE_RAISED,
+             BF_DIAGONAL_ENDBOTTOMLEFT | BF_SOFT | BF_MIDDLE | BF_ADJUST);
+
+    // If the button is pressed, draw hatching.
+    if (extra.classic_state & DFCS_PUSHED) {
+      SkPaint paint;
+      SetCheckerboardShader(&paint, rect_win);
+
+      // Fill all three pieces with the pattern.
+      canvas->drawIRect(skia::RECTToSkIRect(top_section), paint);
+
+      SkScalar left_triangle_top = SkIntToScalar(left_half.top);
+      SkScalar left_triangle_right = SkIntToScalar(left_half.right);
+      SkPath left_triangle;
+      left_triangle.moveTo(SkIntToScalar(left_half.left), left_triangle_top);
+      left_triangle.lineTo(left_triangle_right, left_triangle_top);
+      left_triangle.lineTo(left_triangle_right,
+                           SkIntToScalar(left_half.bottom));
+      left_triangle.close();
+      canvas->drawPath(left_triangle, paint);
+
+      SkScalar right_triangle_left = SkIntToScalar(right_half.left);
+      SkScalar right_triangle_top = SkIntToScalar(right_half.top);
+      SkPath right_triangle;
+      right_triangle.moveTo(right_triangle_left, right_triangle_top);
+      right_triangle.lineTo(SkIntToScalar(right_half.right),
+                            right_triangle_top);
+      right_triangle.lineTo(right_triangle_left,
+                            SkIntToScalar(right_half.bottom));
+      right_triangle.close();
+      canvas->drawPath(right_triangle, paint);
+    }
+  }
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintProgressBar(
+    HDC hdc,
+    const gfx::Rect& rect,
+    const ProgressBarExtraParams& extra) const {
+  // There is no documentation about the animation speed, frame-rate, nor
+  // size of moving overlay of the indeterminate progress bar.
+  // So we just observed real-world programs and guessed following parameters.
+  const int kDeteminateOverlayPixelsPerSecond = 300;
+  const int kDeteminateOverlayWidth = 120;
+  const int kIndeterminateOverlayPixelsPerSecond =  175;
+  const int kVistaIndeterminateOverlayWidth = 120;
+  const int kXPIndeterminateOverlayWidth = 55;
+  // The thickness of the bar frame inside |value_rect|
+  const int kXPBarPadding = 3;
+
+  RECT bar_rect = rect.ToRECT();
+  RECT value_rect = gfx::Rect(extra.value_rect_x,
+                              extra.value_rect_y,
+                              extra.value_rect_width,
+                              extra.value_rect_height).ToRECT();
+
+  bool pre_vista = base::win::GetVersion() < base::win::VERSION_VISTA;
+  HANDLE handle = GetThemeHandle(PROGRESS);
+  if (handle && draw_theme_ && draw_theme_ex_) {
+    draw_theme_(handle, hdc, PP_BAR, 0, &bar_rect, NULL);
+
+    int bar_width = bar_rect.right - bar_rect.left;
+    if (extra.determinate) {
+      // TODO(morrita): this RTL guess can be wrong.
+      // We should pass the direction from WebKit side.
+      bool is_rtl = (bar_rect.right == value_rect.right &&
+                     bar_rect.left != value_rect.left);
+      // We should care the direction here because PP_CNUNK painting
+      // is asymmetric.
+      DTBGOPTS value_draw_options;
+      value_draw_options.dwSize = sizeof(DTBGOPTS);
+      value_draw_options.dwFlags = is_rtl ? DTBG_MIRRORDC : 0;
+      value_draw_options.rcClip = bar_rect;
+
+      if (pre_vista) {
+        // On XP, progress bar is chunk-style and has no glossy effect.
+        // We need to shrink destination rect to fit the part inside the bar
+        // with an appropriate margin.
+        RECT shrunk_value_rect = InsetRect(&value_rect, kXPBarPadding);
+        draw_theme_ex_(handle, hdc, PP_CHUNK, 0,
+                       &shrunk_value_rect, &value_draw_options);
+      } else  {
+        // On Vista or later, the progress bar part has a
+        // single-block value part. It also has glossy effect.
+        // And the value part has exactly same height as the bar part
+        // so we don't need to shrink the rect.
+        draw_theme_ex_(handle, hdc, PP_FILL, 0,
+                       &value_rect, &value_draw_options);
+
+        int dx = ComputeAnimationProgress(bar_width,
+                                          kDeteminateOverlayWidth,
+                                          kDeteminateOverlayPixelsPerSecond,
+                                          extra.animated_seconds);
+        RECT overlay_rect = value_rect;
+        overlay_rect.left += dx;
+        overlay_rect.right = overlay_rect.left + kDeteminateOverlayWidth;
+        draw_theme_(handle, hdc, PP_MOVEOVERLAY, 0, &overlay_rect, &value_rect);
+      }
+    } else {
+      // A glossy overlay for indeterminate progress bar has small pause
+      // after each animation. We emulate this by adding an invisible margin
+      // the animation has to traverse.
+      int width_with_margin = bar_width + kIndeterminateOverlayPixelsPerSecond;
+      int overlay_width = pre_vista ?
+          kXPIndeterminateOverlayWidth : kVistaIndeterminateOverlayWidth;
+      int dx = ComputeAnimationProgress(width_with_margin,
+                                        overlay_width,
+                                        kIndeterminateOverlayPixelsPerSecond,
+                                        extra.animated_seconds);
+      RECT overlay_rect = bar_rect;
+      overlay_rect.left += dx;
+      overlay_rect.right = overlay_rect.left + overlay_width;
+      if (pre_vista) {
+        RECT shrunk_rect = InsetRect(&overlay_rect, kXPBarPadding);
+        RECT shrunk_bar_rect = InsetRect(&bar_rect, kXPBarPadding);
+        draw_theme_(handle, hdc, PP_CHUNK, 0, &shrunk_rect, &shrunk_bar_rect);
+      } else {
+        draw_theme_(handle, hdc, PP_MOVEOVERLAY, 0, &overlay_rect, &bar_rect);
+      }
+    }
+
+    return S_OK;
+  }
+
+  HBRUSH bg_brush = GetSysColorBrush(COLOR_BTNFACE);
+  HBRUSH fg_brush = GetSysColorBrush(COLOR_BTNSHADOW);
+  FillRect(hdc, &bar_rect, bg_brush);
+  FillRect(hdc, &value_rect, fg_brush);
+  DrawEdge(hdc, &bar_rect, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintWindowResizeGripper(HDC hdc,
+                                                 const gfx::Rect& rect) const {
+  HANDLE handle = GetThemeHandle(STATUS);
+  RECT rect_win = rect.ToRECT();
+  if (handle && draw_theme_) {
+    // Paint the status bar gripper.  There doesn't seem to be a
+    // standard gripper in Windows for the space between
+    // scrollbars.  This is pretty close, but it's supposed to be
+    // painted over a status bar.
+    return draw_theme_(handle, hdc, SP_GRIPPER, 0, &rect_win, NULL);
+  }
+
+  // Draw a windows classic scrollbar gripper.
+  DrawFrameControl(hdc, &rect_win, DFC_SCROLL, DFCS_SCROLLSIZEGRIP);
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintTabPanelBackground(HDC hdc,
+                                                const gfx::Rect& rect) const {
+  HANDLE handle = GetThemeHandle(TAB);
+  RECT rect_win = rect.ToRECT();
+  if (handle && draw_theme_)
+    return draw_theme_(handle, hdc, TABP_BODY, 0, &rect_win, NULL);
+
+  // Classic just renders a flat color background.
+  FillRect(hdc, &rect_win, reinterpret_cast<HBRUSH>(COLOR_3DFACE + 1));
+  return S_OK;
+}
+
+HRESULT NativeThemeWin::PaintTextField(
+    HDC hdc,
+    Part part,
+    State state,
+    const gfx::Rect& rect,
+    const TextFieldExtraParams& extra) const {
+  int part_id = EP_EDITTEXT;
+  int state_id = ETS_NORMAL;
+  switch (state) {
+    case kNormal:
+      if (extra.is_read_only) {
+        state_id = ETS_READONLY;
+      } else if (extra.is_focused) {
+        state_id = ETS_FOCUSED;
+      } else {
+        state_id = ETS_NORMAL;
+      }
+      break;
+    case kHovered:
+      state_id = ETS_HOT;
+      break;
+    case kPressed:
+      state_id = ETS_SELECTED;
+      break;
+    case kDisabled:
+      state_id = ETS_DISABLED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
+
+  RECT rect_win = rect.ToRECT();
+  return PaintTextField(hdc, part_id, state_id, extra.classic_state,
+                        &rect_win,
+                        skia::SkColorToCOLORREF(extra.background_color),
+                        extra.fill_content_area, extra.draw_edges);
+}
+
+HRESULT NativeThemeWin::PaintTextField(HDC hdc,
+                                       int part_id,
+                                       int state_id,
+                                       int classic_state,
+                                       RECT* rect,
+                                       COLORREF color,
+                                       bool fill_content_area,
+                                       bool draw_edges) const {
+  // TODO(ojan): http://b/1210017 Figure out how to give the ability to
+  // exclude individual edges from being drawn.
+
+  HANDLE handle = GetThemeHandle(TEXTFIELD);
+  // TODO(mpcomplete): can we detect if the color is specified by the user,
+  // and if not, just use the system color?
+  // CreateSolidBrush() accepts a RGB value but alpha must be 0.
+  HBRUSH bg_brush = CreateSolidBrush(color);
+  HRESULT hr;
+  // DrawThemeBackgroundEx was introduced in XP SP2, so that it's possible
+  // draw_theme_ex_ is NULL and draw_theme_ is non-null.
+  if (handle && (draw_theme_ex_ || (draw_theme_ && draw_edges))) {
+    if (draw_theme_ex_) {
+      static const DTBGOPTS omit_border_options = {
+        sizeof(DTBGOPTS),
+        DTBG_OMITBORDER,
+        { 0, 0, 0, 0 }
+      };
+      const DTBGOPTS* draw_opts = draw_edges ? NULL : &omit_border_options;
+      hr = draw_theme_ex_(handle, hdc, part_id, state_id, rect, draw_opts);
+    } else {
+      hr = draw_theme_(handle, hdc, part_id, state_id, rect, NULL);
+    }
+
+    // TODO(maruel): Need to be fixed if get_theme_content_rect_ is NULL.
+    if (fill_content_area && get_theme_content_rect_) {
+      RECT content_rect;
+      hr = get_theme_content_rect_(handle, hdc, part_id, state_id, rect,
+                                   &content_rect);
+      FillRect(hdc, &content_rect, bg_brush);
+    }
+  } else {
+    // Draw it manually.
+    if (draw_edges)
+      DrawEdge(hdc, rect, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
+
+    if (fill_content_area) {
+      FillRect(hdc, rect, (classic_state & DFCS_INACTIVE) ?
+                   reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1) : bg_brush);
+    }
+    hr = S_OK;
+  }
+  DeleteObject(bg_brush);
+  return hr;
+}
+
+// static
+NativeThemeWin::ThemeName NativeThemeWin::GetThemeName(Part part) {
+  ThemeName name;
+  switch (part) {
+    case kCheckbox:
+    case kRadio:
+    case kPushButton:
+      name = BUTTON;
+      break;
+    case kInnerSpinButton:
+      name = SPIN;
+      break;
+    case kMenuCheck:
+    case kMenuPopupGutter:
+    case kMenuList:
+    case kMenuPopupArrow:
+    case kMenuPopupSeparator:
+      name = MENU;
+      break;
+    case kProgressBar:
+      name = PROGRESS;
+      break;
+    case kScrollbarDownArrow:
+    case kScrollbarLeftArrow:
+    case kScrollbarRightArrow:
+    case kScrollbarUpArrow:
+    case kScrollbarHorizontalThumb:
+    case kScrollbarVerticalThumb:
+    case kScrollbarHorizontalTrack:
+    case kScrollbarVerticalTrack:
+      name = SCROLLBAR;
+      break;
+    case kSliderTrack:
+    case kSliderThumb:
+      name = TRACKBAR;
+      break;
+    case kTextField:
+      name = TEXTFIELD;
+      break;
+    case kWindowResizeGripper:
+      name = STATUS;
+      break;
+    default:
+      NOTREACHED() << "Invalid part: " << part;
+      break;
+  }
+  return name;
+}
+
+// static
+int NativeThemeWin::GetWindowsPart(Part part,
+                                   State state,
+                                   const ExtraParams& extra) {
+  int part_id;
+  switch (part) {
+    case kCheckbox:
+      part_id = BP_CHECKBOX;
+      break;
+    case kMenuCheck:
+      part_id = MENU_POPUPCHECK;
+      break;
+    case kMenuPopupArrow:
+      part_id = MENU_POPUPSUBMENU;
+      break;
+    case kMenuPopupGutter:
+      part_id = MENU_POPUPGUTTER;
+      break;
+    case kMenuPopupSeparator:
+      part_id = MENU_POPUPSEPARATOR;
+      break;
+    case kPushButton:
+      part_id = BP_PUSHBUTTON;
+      break;
+    case kRadio:
+      part_id = BP_RADIOBUTTON;
+      break;
+    case kWindowResizeGripper:
+      part_id = SP_GRIPPER;
+      break;
+    case kScrollbarDownArrow:
+    case kScrollbarLeftArrow:
+    case kScrollbarRightArrow:
+    case kScrollbarUpArrow:
+      part_id = SBP_ARROWBTN;
+      break;
+    case kScrollbarHorizontalThumb:
+      part_id = extra.scrollbar_track.is_upper ? SBP_UPPERTRACKHORZ :
+                                                 SBP_LOWERTRACKHORZ;
+      break;
+    case kScrollbarVerticalThumb:
+      part_id = extra.scrollbar_track.is_upper ? SBP_UPPERTRACKVERT :
+                                                 SBP_LOWERTRACKVERT;
+      break;
+    default:
+      NOTREACHED() << "Invalid part: " << part;
+      break;
+  }
+  return part_id;
+}
+
+int NativeThemeWin::GetWindowsState(Part part,
+                                    State state,
+                                    const ExtraParams& extra) {
+  int state_id;
+  switch (part) {
+    case kCheckbox:
+      switch (state) {
+        case kNormal:
+          state_id = CBS_UNCHECKEDNORMAL;
+          break;
+        case kHovered:
+          state_id = CBS_UNCHECKEDHOT;
+          break;
+        case kPressed:
+          state_id = CBS_UNCHECKEDPRESSED;
+          break;
+        case kDisabled:
+          state_id = CBS_UNCHECKEDDISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kMenuCheck:
+      switch (state) {
+        case kNormal:
+        case kHovered:
+        case kPressed:
+          state_id = extra.menu_check.is_radio ? MC_BULLETNORMAL
+                                               : MC_CHECKMARKNORMAL;
+          break;
+        case kDisabled:
+          state_id = extra.menu_check.is_radio ? MC_BULLETDISABLED
+                                               : MC_CHECKMARKDISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kMenuPopupArrow:
+    case kMenuPopupGutter:
+    case kMenuPopupSeparator:
+      switch (state) {
+        case kNormal:
+          state_id = MBI_NORMAL;
+          break;
+        case kHovered:
+          state_id = MBI_HOT;
+          break;
+        case kPressed:
+          state_id = MBI_PUSHED;
+          break;
+        case kDisabled:
+          state_id = MBI_DISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kPushButton:
+      switch (state) {
+        case kNormal:
+          state_id = PBS_NORMAL;
+          break;
+        case kHovered:
+          state_id = PBS_HOT;
+          break;
+        case kPressed:
+          state_id = PBS_PRESSED;
+          break;
+        case kDisabled:
+          state_id = PBS_DISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kRadio:
+      switch (state) {
+        case kNormal:
+          state_id = RBS_UNCHECKEDNORMAL;
+          break;
+        case kHovered:
+          state_id = RBS_UNCHECKEDHOT;
+          break;
+        case kPressed:
+          state_id = RBS_UNCHECKEDPRESSED;
+          break;
+        case kDisabled:
+          state_id = RBS_UNCHECKEDDISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kWindowResizeGripper:
+      switch (state) {
+        case kNormal:
+        case kHovered:
+        case kPressed:
+        case kDisabled:
+          state_id = 1;  // gripper has no windows state
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kScrollbarDownArrow:
+      switch (state) {
+        case kNormal:
+          state_id = ABS_DOWNNORMAL;
+          break;
+        case kHovered:
+          // Mimic ScrollbarThemeChromiumWin.cpp in WebKit.
+          state_id = base::win::GetVersion() < base::win::VERSION_VISTA ?
+              ABS_DOWNHOT : ABS_DOWNHOVER;
+          break;
+        case kPressed:
+          state_id = ABS_DOWNPRESSED;
+          break;
+        case kDisabled:
+          state_id = ABS_DOWNDISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kScrollbarLeftArrow:
+      switch (state) {
+        case kNormal:
+          state_id = ABS_LEFTNORMAL;
+          break;
+        case kHovered:
+          // Mimic ScrollbarThemeChromiumWin.cpp in WebKit.
+          state_id = base::win::GetVersion() < base::win::VERSION_VISTA ?
+              ABS_LEFTHOT : ABS_LEFTHOVER;
+          break;
+        case kPressed:
+          state_id = ABS_LEFTPRESSED;
+          break;
+        case kDisabled:
+          state_id = ABS_LEFTDISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kScrollbarRightArrow:
+      switch (state) {
+        case kNormal:
+          state_id = ABS_RIGHTNORMAL;
+          break;
+        case kHovered:
+          // Mimic ScrollbarThemeChromiumWin.cpp in WebKit.
+          state_id = base::win::GetVersion() < base::win::VERSION_VISTA ?
+              ABS_RIGHTHOT : ABS_RIGHTHOVER;
+          break;
+        case kPressed:
+          state_id = ABS_RIGHTPRESSED;
+          break;
+        case kDisabled:
+          state_id = ABS_RIGHTDISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kScrollbarUpArrow:
+      switch (state) {
+        case kNormal:
+          state_id = ABS_UPNORMAL;
+          break;
+        case kHovered:
+          // Mimic ScrollbarThemeChromiumWin.cpp in WebKit.
+          state_id = base::win::GetVersion() < base::win::VERSION_VISTA ?
+              ABS_UPHOT : ABS_UPHOVER;
+          break;
+        case kPressed:
+          state_id = ABS_UPPRESSED;
+          break;
+        case kDisabled:
+          state_id = ABS_UPDISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    case kScrollbarHorizontalThumb:
+    case kScrollbarVerticalThumb:
+      switch (state) {
+        case kNormal:
+          state_id = SCRBS_NORMAL;
+          break;
+        case kHovered:
+          // Mimic WebKit's behaviour in ScrollbarThemeChromiumWin.cpp.
+          state_id = base::win::GetVersion() < base::win::VERSION_VISTA ?
+              SCRBS_HOT : SCRBS_HOVER;
+          break;
+        case kPressed:
+          state_id = SCRBS_PRESSED;
+          break;
+        case kDisabled:
+          state_id = SCRBS_DISABLED;
+          break;
+        default:
+          NOTREACHED() << "Invalid state: " << state;
+          break;
+      }
+      break;
+    default:
+      NOTREACHED() << "Invalid part: " << part;
+      break;
+  }
+  return state_id;
+}
+
+HRESULT NativeThemeWin::GetThemeInt(ThemeName theme,
+                                    int part_id,
+                                    int state_id,
+                                    int prop_id,
+                                    int *value) const {
+  HANDLE handle = GetThemeHandle(theme);
+  if (handle && get_theme_int_)
+    return get_theme_int_(handle, part_id, state_id, prop_id, value);
+  return E_NOTIMPL;
+}
+
+HRESULT NativeThemeWin::PaintFrameControl(HDC hdc,
+                                          const gfx::Rect& rect,
+                                          UINT type,
+                                          UINT state,
+                                          bool is_selected,
+                                          State control_state) const {
+  const int width = rect.width();
+  const int height = rect.height();
+
+  // DrawFrameControl for menu arrow/check wants a monochrome bitmap.
+  base::win::ScopedBitmap mask_bitmap(CreateBitmap(width, height, 1, 1, NULL));
+
+  if (mask_bitmap == NULL)
+    return E_OUTOFMEMORY;
+
+  base::win::ScopedCreateDC bitmap_dc(CreateCompatibleDC(NULL));
+  base::win::ScopedSelectObject select_bitmap(bitmap_dc, mask_bitmap);
+  RECT local_rect = { 0, 0, width, height };
+  DrawFrameControl(bitmap_dc, &local_rect, type, state);
+
+  // We're going to use BitBlt with a b&w mask. This results in using the dest
+  // dc's text color for the black bits in the mask, and the dest dc's
+  // background color for the white bits in the mask. DrawFrameControl draws the
+  // check in black, and the background in white.
+  int bg_color_key;
+  int text_color_key;
+  switch (control_state) {
+    case NativeTheme::kHovered:
+      bg_color_key = COLOR_HIGHLIGHT;
+      text_color_key = COLOR_HIGHLIGHTTEXT;
+      break;
+    case NativeTheme::kNormal:
+      bg_color_key = COLOR_MENU;
+      text_color_key = COLOR_MENUTEXT;
+      break;
+    case NativeTheme::kDisabled:
+      bg_color_key = is_selected ? COLOR_HIGHLIGHT : COLOR_MENU;
+      text_color_key = COLOR_GRAYTEXT;
+      break;
+    default:
+      NOTREACHED();
+      bg_color_key = COLOR_MENU;
+      text_color_key = COLOR_MENUTEXT;
+      break;
+  }
+  COLORREF old_bg_color = SetBkColor(hdc, GetSysColor(bg_color_key));
+  COLORREF old_text_color = SetTextColor(hdc, GetSysColor(text_color_key));
+  BitBlt(hdc, rect.x(), rect.y(), width, height, bitmap_dc, 0, 0, SRCCOPY);
+  SetBkColor(hdc, old_bg_color);
+  SetTextColor(hdc, old_text_color);
+
+  return S_OK;
+}
+
+HANDLE NativeThemeWin::GetThemeHandle(ThemeName theme_name) const {
+  if (!open_theme_ || theme_name < 0 || theme_name >= LAST)
+    return 0;
+
+  if (theme_handles_[theme_name])
+    return theme_handles_[theme_name];
+
+  // Not found, try to load it.
+  HANDLE handle = 0;
+  switch (theme_name) {
+  case BUTTON:
+    handle = open_theme_(NULL, L"Button");
+    break;
+  case LIST:
+    handle = open_theme_(NULL, L"Listview");
+    break;
+  case MENU:
+    handle = open_theme_(NULL, L"Menu");
+    break;
+  case MENULIST:
+    handle = open_theme_(NULL, L"Combobox");
+    break;
+  case SCROLLBAR:
+    handle = open_theme_(NULL, L"Scrollbar");
+    break;
+  case STATUS:
+    handle = open_theme_(NULL, L"Status");
+    break;
+  case TAB:
+    handle = open_theme_(NULL, L"Tab");
+    break;
+  case TEXTFIELD:
+    handle = open_theme_(NULL, L"Edit");
+    break;
+  case TRACKBAR:
+    handle = open_theme_(NULL, L"Trackbar");
+    break;
+  case WINDOW:
+    handle = open_theme_(NULL, L"Window");
+    break;
+  case PROGRESS:
+    handle = open_theme_(NULL, L"Progress");
+    break;
+  case SPIN:
+    handle = open_theme_(NULL, L"Spin");
+    break;
+  default:
+    NOTREACHED();
+  }
+  theme_handles_[theme_name] = handle;
+  return handle;
+}
+
+}  // namespace ui