Added support for HTML5 progress element.

gfx/native_theme_win.cc

Index: gfx/native_theme_win.cc
diff --git a/gfx/native_theme_win.cc b/gfx/native_theme_win.cc
index 87024d3a68083a0642751c0da5221c90dbee6a37..4a91a6d4571af2848c5192568b01f4837d31a1ac 100644
--- a/gfx/native_theme_win.cc
+++ b/gfx/native_theme_win.cc
@@ -59,7 +59,8 @@ const NativeTheme* NativeTheme::instance() {
 }
 
 NativeTheme::NativeTheme()
-    : theme_dll_(LoadLibrary(L"uxtheme.dll")),
+    : theme_dll_(LoadLibrary(L"uxtheme.dll")), 
+      clip_(NULL),
       draw_theme_(NULL),
       draw_theme_ex_(NULL),
       get_theme_color_(NULL),
@@ -101,6 +102,9 @@ NativeTheme::~NativeTheme() {
     // CloseHandles();
     FreeLibrary(theme_dll_);
   }
+
+  if (clip_)
+    DeleteObject(clip_);
 }
 
 HRESULT NativeTheme::PaintButton(HDC hdc,
@@ -478,6 +482,38 @@ HRESULT NativeTheme::PaintTrackbar(HDC hdc,
   return S_OK;
 }
 
+HRESULT NativeTheme::PaintProgressBar(HDC hdc,
+                                      RECT* bar_rect,
+                                      int value_part_id,
+                                      RECT* value_rect,
+                                      skia::PlatformCanvas* canvas) const {
+
+  // We need to clip painting because the value theme 
+  // for indeterminate overflows bar rectangle.
+  HRGN clip = GetClipHandle();
+  GetClipRgn(hdc, clip);
+  IntersectClipRect(hdc, bar_rect->left, bar_rect->top, 
+                    bar_rect->right, bar_rect->bottom);
+
+  HANDLE handle = GetThemeHandle(PROGRESS);
+  if (handle && draw_theme_) {
+    draw_theme_(handle, hdc, PP_BAR, 0, bar_rect, NULL);
+    draw_theme_(handle, hdc, value_part_id, 0, value_rect, NULL);
+
+    SelectClipRgn(hdc, clip);
+    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);
+
+  SelectClipRgn(hdc, clip);
+  return S_OK;
+}
+
 HRESULT NativeTheme::PaintTextField(HDC hdc,
                                     int part_id,
                                     int state_id,
@@ -659,6 +695,17 @@ void NativeTheme::CloseHandles() const
   }
 }
 
+HRGN NativeTheme::GetClipHandle() const {
+  if (!clip_) {
+    RECT dummy_rect;
+    dummy_rect.left = dummy_rect.right = 0;
+    dummy_rect.top = dummy_rect.bottom = 0;
+    clip_ = CreateRectRgnIndirect(&dummy_rect);
+  }
+
+  return clip_;
+}
+
 HANDLE NativeTheme::GetThemeHandle(ThemeName theme_name) const
 {
   if (!open_theme_ || theme_name < 0 || theme_name >= LAST)
@@ -700,6 +747,9 @@ HANDLE NativeTheme::GetThemeHandle(ThemeName theme_name) const
   case WINDOW:
     handle = open_theme_(NULL, L"Window");
     break;
+  case PROGRESS:
+    handle = open_theme_(NULL, L"Progress");
+    break;
   default:
     NOTREACHED();
   }