Add support for drawing window caption buttons on windows.

ui/native_theme/native_theme_win.cc

Index: ui/native_theme/native_theme_win.cc
diff --git a/ui/native_theme/native_theme_win.cc b/ui/native_theme/native_theme_win.cc
index 8539fe663c5596101958d19bfaa0a28bd1c075ad..5f7798538e07e590c0d3177336bfe2182d701674 100644
--- a/ui/native_theme/native_theme_win.cc
+++ b/ui/native_theme/native_theme_win.cc
@@ -464,6 +464,12 @@ void NativeThemeWin::PaintDirect(SkCanvas* canvas,
     case kWindowResizeGripper:
       PaintWindowResizeGripper(hdc, rect);
       return;
+    case kCaptionMin:
+    case kCaptionMax:
+    case kCaptionRestore:
+    case kCaptionClose:
+      PaintCaptionButton(hdc, part, state, rect, extra);
+      return;
     case kComboboxArrow:
     case kSliderTrack:
     case kSliderThumb:
@@ -1563,6 +1569,60 @@ HRESULT NativeThemeWin::PaintTabPanelBackground(HDC hdc,
   return S_OK;
 }
 
+HRESULT NativeThemeWin::PaintCaptionButton(HDC hdc,
+                                           Part part,
+                                           State state,
+                                           const gfx::Rect&rect,
+                                           const ExtraParams& extra) const {
+  HANDLE handle = GetThemeHandle(WINDOW);
+  RECT rect_win = rect.ToRECT();
+  if (handle && draw_theme_) {
+    int part_id = GetWindowsPart(part, state, extra);
+    int state_id = GetWindowsState(part, state, extra);
+    return draw_theme_(handle, hdc, part_id, state_id, &rect_win, NULL);
+  }
+
+  // Adjust classic_state based on part, state, and extras.
+  int classic_state = 0;
+  switch (part) {
+    case kCaptionMin:
+      classic_state |= DFCS_CAPTIONMIN;
+      break;
+    case kCaptionMax:
+      classic_state |= DFCS_CAPTIONMAX;
+      break;
+    case kCaptionRestore:
+      classic_state |= DFCS_CAPTIONRESTORE;
+      break;
+    case kCaptionClose:
+      classic_state |= DFCS_CAPTIONCLOSE;
+      break;
+    default:
+      NOTREACHED();
+      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;
+    case kNumStates:
+      NOTREACHED();
+      break;
+  }
+
+  DrawFrameControl(hdc, &rect_win, DFC_CAPTION, classic_state);
+  return S_OK;
+}
+
 HRESULT NativeThemeWin::PaintTextField(
     HDC hdc,
     Part part,
@@ -1754,6 +1814,14 @@ int NativeThemeWin::GetWindowsPart(Part part,
       return SBP_THUMBBTNVERT;
     case kWindowResizeGripper:
       return SP_GRIPPER;
+    case kCaptionMin:
+      return WP_MINBUTTON;
+    case kCaptionMax:
+      return WP_MAXBUTTON;
+    case kCaptionRestore:
+      return WP_RESTOREBUTTON;
+    case kCaptionClose:
+      return WP_CLOSEBUTTON;
     case kComboboxArrow:
     case kInnerSpinButton:
     case kMenuList:
@@ -1948,6 +2016,62 @@ int NativeThemeWin::GetWindowsState(Part part,
           NOTREACHED();
           return 0;
       }
+    case kCaptionMin:
+      switch (state) {
+        case kDisabled:
+          return MINBS_DISABLED;
+        case kHovered:
+          return MINBS_HOT;
+        case kNormal:
+          return MINBS_NORMAL;
+        case kPressed:
+          return MINBS_PUSHED;
+        case kNumStates:
+          NOTREACHED();
+          return 0;
+      }
+    case kCaptionMax:
+      switch (state) {
+        case kDisabled:
+          return MAXBS_DISABLED;
+        case kHovered:
+          return MAXBS_HOT;
+        case kNormal:
+          return MAXBS_NORMAL;
+        case kPressed:
+          return MAXBS_PUSHED;
+        case kNumStates:
+          NOTREACHED();
+          return 0;
+      }
+    case kCaptionRestore:
+      switch (state) {
+        case kDisabled:
+          return RBS_DISABLED;
+        case kHovered:
+          return RBS_HOT;
+        case kNormal:
+          return RBS_NORMAL;
+        case kPressed:
+          return RBS_PUSHED;
+        case kNumStates:
+          NOTREACHED();
+          return 0;
+      }
+    case kCaptionClose:
+      switch (state) {
+        case kDisabled:
+          return CBS_DISABLED;
+        case kHovered:
+          return CBS_HOT;
+        case kNormal:
+          return CBS_NORMAL;
+        case kPressed:
+          return CBS_PUSHED;
+        case kNumStates:
+          NOTREACHED();
+          return 0;
+      }
     case kComboboxArrow:
     case kInnerSpinButton:
     case kMenuList: