Mojo: Add WebThemeEngine implementation.

mojo/examples/html_viewer/blink_platform_impl.cc

 // 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 "mojo/examples/html_viewer/blink_platform_impl.h"
 
 #include <cmath>
 
 #include "base/rand_util.h"
 #include "base/stl_util.h"
@@ skipping 46 matching lines @@
 }
 
 BlinkPlatformImpl::~BlinkPlatformImpl() {
 }
 
 blink::WebMimeRegistry* BlinkPlatformImpl::mimeRegistry() {
   return &mime_registry_;
 }
 
 blink::WebThemeEngine* BlinkPlatformImpl::themeEngine() {
-  return &dummy_theme_engine_;
+  return &theme_engine_;
 }
 
 blink::WebString BlinkPlatformImpl::defaultLocale() {
   return blink::WebString::fromUTF8("en-US");
 }
 
 double BlinkPlatformImpl::currentTime() {
   return base::Time::Now().ToDoubleT();
 }
 
@@ skipping 126 matching lines @@
 
 // static
 void BlinkPlatformImpl::DestroyCurrentThread(void* thread) {
   WebThreadImplForMessageLoop* impl =
       static_cast<WebThreadImplForMessageLoop*>(thread);
   delete impl;
 }
 
 }  // namespace examples
 }  // namespace mojo