Fixed the bug that caused extension options not to fit their overlays properly when zoomed.

extensions/browser/guest_view/guest_view_base.cc

Index: extensions/browser/guest_view/guest_view_base.cc
diff --git a/extensions/browser/guest_view/guest_view_base.cc b/extensions/browser/guest_view/guest_view_base.cc
index 0f81f272927e0cd4de15f7291fd2666ff8ae6c1d..58bf893eedf1b7d45355fa68bba3b84911ff0c84 100644
--- a/extensions/browser/guest_view/guest_view_base.cc
+++ b/extensions/browser/guest_view/guest_view_base.cc
@@ -510,6 +510,18 @@ void GuestViewBase::WillAttach(content::WebContents* embedder_web_contents,
   WillAttachToEmbedder();
 }
 
+int GuestViewBase::LogicalPixelsToPhysicalPixels(double logical_pixels) {
+  DCHECK(logical_pixels >= 0);
+  double zoom_factor = GetEmbedderZoomFactor();
+  return lround(logical_pixels * zoom_factor);
+}
+
+double GuestViewBase::PhysicalPixelsToLogicalPixels(int physical_pixels) {
+  DCHECK(physical_pixels >= 0);
+  double zoom_factor = GetEmbedderZoomFactor();
+  return physical_pixels / zoom_factor;
+}
+
 void GuestViewBase::DidStopLoading(content::RenderViewHost* render_view_host) {
   if (IsPreferredSizeModeEnabled()) {
     render_view_host->EnablePreferredSizeMode();
@@ -731,18 +743,6 @@ double GuestViewBase::GetEmbedderZoomFactor() {
   return zoom_factor;
 }
 
-int GuestViewBase::LogicalPixelsToPhysicalPixels(double logical_pixels) {
-  DCHECK(logical_pixels >= 0);
-  double zoom_factor = GetEmbedderZoomFactor();
-  return static_cast<int>(logical_pixels * zoom_factor + 0.5);
-}
-
-double GuestViewBase::PhysicalPixelsToLogicalPixels(int physical_pixels) {
-  DCHECK(physical_pixels >= 0);
-  double zoom_factor = GetEmbedderZoomFactor();
-  return physical_pixels * zoom_factor;
-}
-
 void GuestViewBase::SetUpSizing(const base::DictionaryValue& params) {
   // Read the autosize parameters passed in from the embedder.
   bool auto_size_enabled = false;