Adds a tooltip to the frame maximize button.

BUG=none
TEST=none
R=jamescook@chromium.org


Review URL: http://codereview.chromium.org/9834015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@128259 0039d316-1c4b-4281-b951-d872f2087c98

ash/ash_strings.grd

@@ -174,6 +174,10 @@ This file contains the strings for ash.
         Overflow Button
       </message>
 
+      <message name="IDS_FRAME_MAXIMIZE_BUTTON_TOOLTIP" desc="Tooltip for the maximize/restore button in window frames in aura">
+        Pull down to minimize, left or right to tile
+      </message>
+
       <!-- Status tray items -->
       <message name="IDS_ASH_STATUS_TRAY_ACCESSIBLE_NAME" desc="The accessible name of the status tray.">
         Status tray

ash/wm/workspace/frame_maximize_button.cc

@@ -10,9 +10,11 @@
 #include "ash/launcher/launcher.h"
 #include "ash/wm/workspace/phantom_window_controller.h"
 #include "ash/wm/workspace/snap_sizer.h"
+#include "grit/ash_strings.h"
 #include "grit/ui_resources.h"
 #include "ui/aura/event.h"
 #include "ui/aura/event_filter.h"
+#include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/screen.h"
@@ -98,6 +100,7 @@ FrameMaximizeButton::FrameMaximizeButton(views::ButtonListener* listener,
       snap_type_(SNAP_NONE) {
   // TODO(sky): nuke this. It's temporary while we don't have good images.
   SetImageAlignment(ALIGN_LEFT, ALIGN_BOTTOM);
+  SetTooltipText(l10n_util::GetStringUTF16(IDS_FRAME_MAXIMIZE_BUTTON_TOOLTIP));
 }
 
 FrameMaximizeButton::~FrameMaximizeButton() {