Don't animate the download shelf when entering/exiting fullscreen.

chrome/browser/ui/cocoa/download/download_shelf_controller.mm

Index: chrome/browser/ui/cocoa/download/download_shelf_controller.mm
diff --git a/chrome/browser/ui/cocoa/download/download_shelf_controller.mm b/chrome/browser/ui/cocoa/download/download_shelf_controller.mm
index cc0cc76fd28091fcce7f9f5dbb5f085c77741c3f..364bf2a76af43654e79df54fc20dbc0741621d28 100644
--- a/chrome/browser/ui/cocoa/download/download_shelf_controller.mm
+++ b/chrome/browser/ui/cocoa/download/download_shelf_controller.mm
@@ -227,7 +227,8 @@ const NSSize kHoverCloseButtonDefaultSize = { 18, 18 };
 }
 
 - (void)showDownloadShelf:(BOOL)show
-             isUserAction:(BOOL)isUserAction {
+             isUserAction:(BOOL)isUserAction
+                  animate:(BOOL)animate {
   [self cancelAutoClose];
   shouldCloseOnMouseExit_ = NO;
 
@@ -251,11 +252,11 @@ const NSSize kHoverCloseButtonDefaultSize = { 18, 18 };
   // do no animation over janky animation.  Find a way to make animating in
   // smoother.

[Nico, 2017/02/17 15:53:46]

maybe we can reconsider this now that machines are 5 years faster?

[Sidney San Martín, 2017/02/17 16:07:08]

I am 100% planning to do this when I get back to my downloads bar rework (soon).

   AnimatableView* view = [self animatableView];
-  if (show) {
-    [view setHeight:maxShelfHeight_];
-    [view setHidden:NO];
-  } else {
+  if (animate && !show) {
     [view animateToNewHeight:0 duration:kDownloadShelfCloseDuration];
+  } else {
+    [view setHeight:show ? maxShelfHeight_ : 0];
+    [view setHidden:!show];
   }
 
   barIsVisible_ = show;