Convert Layout() calls to InvalidateLayout().

Once a layout is performed, if anything moves, that will schedule paints
as appropriate.

Bug: 627663
Change-Id: Ia6c32431f39af8380ebb9e9ec9a357ea5366da84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348292Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797509}

chrome/browser/ui/views/download/download_shelf_view.cc

@@ -199,8 +199,7 @@ void DownloadShelfView::Layout() {
 
 void DownloadShelfView::AnimationProgressed(const gfx::Animation* animation) {
   if (animation == &new_item_animation_) {
-    Layout();
-    SchedulePaint();
+    InvalidateLayout();
   } else if (animation == &shelf_animation_) {
     // Force a re-layout of the parent, which will call back into
     // GetPreferredSize, where we will do our animation. In the case where the
@@ -285,8 +284,7 @@ void DownloadShelfView::RemoveDownloadView(View* view) {
     Close();
   else
     AutoClose();
-  Layout();
-  SchedulePaint();
+  InvalidateLayout();
 }
 
 void DownloadShelfView::ConfigureButtonForTheme(views::MdTextButton* button) {