cefclient: win: Support window state restore (see issue #3359)

The cefclient sample app on Windows will persist window state across application
restart if run with cache_path and persist_user_references enabled.

To test:
1. Run `cefclient --cache-path=/path/to/cache --persist-user-preferences`
2. Move or resize the window, maximize, minimize, etc.
3. Exit cefclient.
4. Run cefclient again with the same arguments. The previous window state will
   be restored.

libcef/browser/views/display_impl.cc

@@ -75,6 +75,32 @@ CefPoint CefDisplay::ConvertScreenPointFromPixels(const CefPoint& point) {
 #endif
 }
 
+// static
+CefRect CefDisplay::ConvertScreenRectToPixels(const CefRect& rect) {
+  CEF_REQUIRE_UIT_RETURN(CefRect());
+#if BUILDFLAG(IS_WIN)
+  const gfx::Rect pix_rect = view_util::ConvertRectToPixels(
+      gfx::Rect(rect.x, rect.y, rect.width, rect.height));
+  return CefRect(pix_rect.x(), pix_rect.y(), pix_rect.width(),
+                 pix_rect.height());
+#else
+  return rect;
+#endif
+}
+
+// static
+CefRect CefDisplay::ConvertScreenRectFromPixels(const CefRect& rect) {
+  CEF_REQUIRE_UIT_RETURN(CefRect());
+#if BUILDFLAG(IS_WIN)
+  const gfx::Rect dip_rect = view_util::ConvertRectFromPixels(
+      gfx::Rect(rect.x, rect.y, rect.width, rect.height));
+  return CefRect(dip_rect.x(), dip_rect.y(), dip_rect.width(),
+                 dip_rect.height());
+#else
+  return rect;
+#endif
+}
+
 CefDisplayImpl::CefDisplayImpl(const display::Display& display)
     : display_(display) {
   CEF_REQUIRE_UIT();

libcef/browser/views/view_util.cc

@@ -236,6 +236,14 @@ gfx::Point ConvertPointFromPixels(const gfx::Point& point) {
 gfx::Point ConvertPointToPixels(const gfx::Point& point) {
   return display::win::ScreenWin::DIPToScreenPoint(point);
 }
+
+gfx::Rect ConvertRectFromPixels(const gfx::Rect& rect) {
+  return display::win::ScreenWin::ScreenToDIPRect(nullptr, rect);
+}
+
+gfx::Rect ConvertRectToPixels(const gfx::Rect& rect) {
+  return display::win::ScreenWin::DIPToScreenRect(nullptr, rect);
+}
 #endif  // BUILDFLAG(IS_WIN)
 
 bool ConvertPointToScreen(views::View* view,

libcef/browser/views/view_util.h

@@ -97,6 +97,12 @@ gfx::Point ConvertPointFromPixels(const gfx::Point& point);
 
 // Convert |point| from DIP screen coordinates to pixel screen coordinates.
 gfx::Point ConvertPointToPixels(const gfx::Point& point);
+
+// Convert |rect| from pixel screen coordinates to DIP screen coordinates.
+gfx::Rect ConvertRectFromPixels(const gfx::Rect& rect);
+
+// Convert |rect| from DIP screen coordinates to pixel screen coordinates.
+gfx::Rect ConvertRectToPixels(const gfx::Rect& rect);
 #endif  // BUILDFLAG(IS_WIN)
 
 // Convert |point| from |view| to screen coordinates. If |output_pixel_coords|