mac: Makeshift UI for scroll feedback.

Heavily based on code by Alexei Svitkine <[email protected]>

BUG=90228
TEST=two-finger history scroll. get some ui feedback.

Review URL: http://codereview.chromium.org/7645041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97022 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index e108d58..35b8cf5 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -2510,6 +2510,8 @@
         'browser/ui/cocoa/history_menu_bridge.mm',
         'browser/ui/cocoa/history_menu_cocoa_controller.h',
         'browser/ui/cocoa/history_menu_cocoa_controller.mm',
+        'browser/ui/cocoa/history_overlay_controller.h',
+        'browser/ui/cocoa/history_overlay_controller.mm',
         'browser/ui/cocoa/hover_button.h',
         'browser/ui/cocoa/hover_button.mm',
         'browser/ui/cocoa/hover_close_button.h',