Make window metrics doubles to reduce rounding issues. (#5556)

lib/ui/window/viewport_metrics.h

@@ -10,17 +10,17 @@
 namespace blink {
 
 struct ViewportMetrics {
-  float device_pixel_ratio = 1.0;
-  int32_t physical_width = 0;
-  int32_t physical_height = 0;
-  int32_t physical_padding_top = 0;
-  int32_t physical_padding_right = 0;
-  int32_t physical_padding_bottom = 0;
-  int32_t physical_padding_left = 0;
-  int32_t physical_view_inset_top = 0;
-  int32_t physical_view_inset_right = 0;
-  int32_t physical_view_inset_bottom = 0;
-  int32_t physical_view_inset_left = 0;
+  double device_pixel_ratio = 1.0;
+  double physical_width = 0;
+  double physical_height = 0;
+  double physical_padding_top = 0;
+  double physical_padding_right = 0;
+  double physical_padding_bottom = 0;
+  double physical_padding_left = 0;
+  double physical_view_inset_top = 0;
+  double physical_view_inset_right = 0;
+  double physical_view_inset_bottom = 0;
+  double physical_view_inset_left = 0;
 };
 
 struct LogicalSize {

lib/ui/window/window.cc

@@ -149,16 +149,16 @@ void Window::UpdateWindowMetrics(const ViewportMetrics& metrics) {
       library_.value(), "_updateWindowMetrics",
       {
           ToDart(metrics.device_pixel_ratio),
-          ToDart(static_cast<double>(metrics.physical_width)),
-          ToDart(static_cast<double>(metrics.physical_height)),
-          ToDart(static_cast<double>(metrics.physical_padding_top)),
-          ToDart(static_cast<double>(metrics.physical_padding_right)),
-          ToDart(static_cast<double>(metrics.physical_padding_bottom)),
-          ToDart(static_cast<double>(metrics.physical_padding_left)),
-          ToDart(static_cast<double>(metrics.physical_view_inset_top)),
-          ToDart(static_cast<double>(metrics.physical_view_inset_right)),
-          ToDart(static_cast<double>(metrics.physical_view_inset_bottom)),
-          ToDart(static_cast<double>(metrics.physical_view_inset_left)),
+          ToDart(metrics.physical_width),
+          ToDart(metrics.physical_height),
+          ToDart(metrics.physical_padding_top),
+          ToDart(metrics.physical_padding_right),
+          ToDart(metrics.physical_padding_bottom),
+          ToDart(metrics.physical_padding_left),
+          ToDart(metrics.physical_view_inset_top),
+          ToDart(metrics.physical_view_inset_right),
+          ToDart(metrics.physical_view_inset_bottom),
+          ToDart(metrics.physical_view_inset_left),
       });
 }