[Mac] Enable click-drag-release behavior in the Wrench menu's custom items.

XIB changes:
* Replace the edit item's segmented control with 3 buttons
* Make the root view of both items a MenuTrackedRootView
* Use the custom MenuTrackedButton for all the buttons

BUG=49356
TEST=Click open the Wrench menu, hold, and drag over the buttons and they perform their function.

Review URL: http://codereview.chromium.org/3072014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@54804 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 6e434c6..150f0fd 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -927,6 +927,10 @@
         'browser/cocoa/menu_button.mm',
         'browser/cocoa/menu_controller.h',
         'browser/cocoa/menu_controller.mm',
+        'browser/cocoa/menu_tracked_button.h',
+        'browser/cocoa/menu_tracked_button.mm',
+        'browser/cocoa/menu_tracked_root_view.h',
+        'browser/cocoa/menu_tracked_root_view.mm',
         'browser/cocoa/multi_key_equivalent_button.h',
         'browser/cocoa/multi_key_equivalent_button.mm',
         'browser/cocoa/new_tab_button.h',