MacViews: Implement Tooltips

ui/views/widget/native_widget_mac.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 155 matching lines @@
 }
 
 void* NativeWidgetMac::GetNativeWindowProperty(const char* name) const {
   if (bridge_)
     return bridge_->GetNativeWindowProperty(name);
 
   return nullptr;
 }
 
 TooltipManager* NativeWidgetMac::GetTooltipManager() const {
-  NOTIMPLEMENTED();
-  return NULL;
+  if (bridge_)
+    return bridge_->tooltip_manager();
+
+  return nullptr;
 }
 
 void NativeWidgetMac::SetCapture() {
   if (bridge_ && !bridge_->HasCapture())
     bridge_->AcquireCapture();
 }
 
 void NativeWidgetMac::ReleaseCapture() {
   if (bridge_)
     bridge_->ReleaseCapture();
@@ skipping 450 matching lines @@
 }
 
 // static
 gfx::FontList NativeWidgetPrivate::GetWindowTitleFontList() {
   NOTIMPLEMENTED();
   return gfx::FontList();
 }
 
 }  // namespace internal
 }  // namespace views