Merge 261465 "Force software layer to redraw when it is resized."

> Force software layer to redraw when it is resized.
> 
> Consider the following sequence of events:
> 1. The view is initialized with a size of 0x0
> 2. A frame comes in at a size of 50x50. Nothing is drawn.
> 3. The view is resized to 50x50.
> 
> We should re-draw the full frame at step 3, but we don't. This patch
> makes it so that we do.
> 
> BUG=358450
> 
> Review URL: https://codereview.chromium.org/217283006

TBR=ccameron@chromium.org

Review URL: https://codereview.chromium.org/226343003

git-svn-id: svn://svn.chromium.org/chrome/branches/1916/src@261802 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 1 deletions

diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 2138a3b..a155365 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -2267,7 +2267,12 @@ void RenderWidgetHostViewMac::LayoutLayers() {
   // in the layer being anchored to the top-left. Set the layer's frame
   // explicitly, since this is more reliable in practice.
   if (software_layer_) {
-    [software_layer_ setFrame:new_background_frame];
+    bool frame_changed = !CGRectEqualToRect(
+        new_background_frame, [software_layer_ frame]);
+    if (frame_changed) {
+      [software_layer_ setFrame:new_background_frame];
+      [software_layer_ setNeedsDisplay];
+    }
   }
 }