Added support for HTML5 progress element.

gfx/native_theme_win.h

Index: gfx/native_theme_win.h
diff --git a/gfx/native_theme_win.h b/gfx/native_theme_win.h
index 504ce4629008f16a88bf41ea63e1755541cec1a8..51751054cbecc44dea19c9221f63e664693e4754 100644
--- a/gfx/native_theme_win.h
+++ b/gfx/native_theme_win.h
@@ -43,6 +43,7 @@ class NativeTheme {
     TEXTFIELD,
     TRACKBAR,
     WINDOW,
+    PROGRESS,
     LAST
   };
 
@@ -207,6 +208,12 @@ class NativeTheme {
                         RECT* rect,
                         skia::PlatformCanvas* canvas) const;
 
+  HRESULT PaintProgressBar(HDC hdc,
+                           RECT* bar_rect,
+                           int value_part_id,
+                           RECT* value_rect,
+                           skia::PlatformCanvas* canvas) const;
+
   bool IsThemingActive() const;
 
   HRESULT GetThemePartSize(ThemeName themeName,
@@ -269,6 +276,7 @@ class NativeTheme {
 
   // Returns a handle to the theme data.
   HANDLE GetThemeHandle(ThemeName theme_name) const;
+  HRGN GetClipHandle() const;
 
   // Function pointers into uxtheme.dll.
   DrawThemeBackgroundPtr draw_theme_;
@@ -284,7 +292,8 @@ class NativeTheme {
 
   // Handle to uxtheme.dll.
   HMODULE theme_dll_;
-
+  // A cache of original clipping handle
+  mutable HRGN clip_;
   // A cache of open theme handles.
   mutable HANDLE theme_handles_[LAST];