[Win] Update HWND style when SizeConstraintsChanged.

ui/views/win/hwnd_message_handler.cc

Index: ui/views/win/hwnd_message_handler.cc
diff --git a/ui/views/win/hwnd_message_handler.cc b/ui/views/win/hwnd_message_handler.cc
index f14b93d313c3b8716a2df2709771b2b0d8556b20..9ab9ee6db3bbc4329e36291d15dbfe0b381bd54c 100644
--- a/ui/views/win/hwnd_message_handler.cc
+++ b/ui/views/win/hwnd_message_handler.cc
@@ -868,6 +868,23 @@ void HWNDMessageHandler::SetFullscreen(bool fullscreen) {
     PerformDwmTransition();
 }
 
+void HWNDMessageHandler::SizeConstraintsChanged() {
+  LONG style = GetWindowLong(hwnd(), GWL_STYLE);
+  if (delegate_->CanResize()) {
+    style |= WS_THICKFRAME | WS_MAXIMIZEBOX;
+    if (!delegate_->CanMaximize())
+      style &= ~WS_MAXIMIZEBOX;
+  } else {
+    style &= ~WS_THICKFRAME | WS_MAXIMIZEBOX;

[sky, 2014/09/24 15:33:00]

Can you put () around WS_THICKFRAME | WS_MAXIMIZEBOX, eg ~(WS_THICKFRAME |
WS_MAXIMIZEBOX) ?

[jackhou1, 2014/09/24 23:30:35]

Oh, good catch.

+  }
+  if (delegate_->CanMinimize()) {
+    style |= WS_MINIMIZEBOX;
+  } else {
+    style &= ~WS_MINIMIZEBOX;
+  }
+  SetWindowLong(hwnd(), GWL_STYLE, style);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // HWNDMessageHandler, InputMethodDelegate implementation: