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

chrome/browser/ui/exclusive_access/fullscreen_controller.cc

Index: chrome/browser/ui/exclusive_access/fullscreen_controller.cc
diff --git a/chrome/browser/ui/exclusive_access/fullscreen_controller.cc b/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
index 04d2a6de8f66ede1e09f2b5728bdeeaab07a86f4..70ee7a5dcdf65958aae4fe3ae182b3df1f3b4351 100644
--- a/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
+++ b/chrome/browser/ui/exclusive_access/fullscreen_controller.cc
@@ -238,6 +238,15 @@ void FullscreenController::OnTabClosing(WebContents* web_contents) {
     ExclusiveAccessControllerBase::OnTabClosing(web_contents);
 }
 
+void FullscreenController::WindowFullscreenStateWillChange() {
+  auto* exclusive_access_context = exclusive_access_manager()->context();

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

nit: style guide says "only use auto if type obvious"

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

Done.

+  if (exclusive_access_context->IsFullscreen()) {
+    exclusive_access_context->HideDownloadShelf();
+  } else {
+    exclusive_access_context->UnhideDownloadShelf();
+  }
+}
+
 void FullscreenController::WindowFullscreenStateChanged() {
   reentrant_window_state_change_call_check_ = true;
   ExclusiveAccessContext* const exclusive_access_context =
@@ -249,9 +258,6 @@ void FullscreenController::WindowFullscreenStateChanged() {
     toggled_into_fullscreen_ = false;
     extension_caused_fullscreen_ = GURL();
     NotifyTabExclusiveAccessLost();
-    exclusive_access_context->UnhideDownloadShelf();
-  } else {
-    exclusive_access_context->HideDownloadShelf();
   }
 }