mus: Implement interwindow drag and drop

ui/views/mus/os_exchange_data_provider_mus.cc

 // Copyright 2016 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/mus/os_exchange_data_provider_mus.h"
 
 #include "base/stl_util.h"
 #include "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mojo/common/common_type_converters.h"
@@ skipping 33 matching lines @@
                          std::vector<uint8_t>* bytes) {
   const unsigned char* front =
       reinterpret_cast<const uint8_t*>(str.data());
   bytes->insert(bytes->end(), front, front + (str.size() * 2));
 }
 
 }  // namespace
 
 OSExchangeDataProviderMus::OSExchangeDataProviderMus() {}
 
+OSExchangeDataProviderMus::OSExchangeDataProviderMus(const Data& data)
+    : mime_data_(data) {}
+
 OSExchangeDataProviderMus::~OSExchangeDataProviderMus() {}
 
 OSExchangeDataProviderMus::Data OSExchangeDataProviderMus::GetData() const {
   return mime_data_;
 }
 
 std::unique_ptr<ui::OSExchangeData::Provider>
 OSExchangeDataProviderMus::Clone() const {
   std::unique_ptr<OSExchangeDataProviderMus> r =
       base::MakeUnique<OSExchangeDataProviderMus>();
@@ skipping 291 matching lines @@
   GURL test_url(str);
   if (!test_url.is_valid())
     return false;
 
   if (url)
     *url = test_url;
   return true;
 }
 
 }  // namespace views