Migrate components/data_reduction_proxy to Mojo interfaces.

components/data_reduction_proxy/content/browser/data_reduction_proxy_host_impl.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 "components/data_reduction_proxy/content/browser/data_reduction_proxy_host_impl.h"
+
+#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h"
+#include "content/public/browser/browser_thread.h"
+#include "net/base/host_port_pair.h"
+
+namespace data_reduction_proxy {
+
+// static
+void DataReductionProxyHostImpl::Create(
+    base::WeakPtr<DataReductionProxyConfig> config,
+    mojom::DataReductionProxyHostRequest request) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  if (config) {
+    new data_reduction_proxy::DataReductionProxyHostImpl(config,

[dcheng, 2016/08/26 19:16:20]

Does it make sense to actually call Create if |config| is null? I'm not sure why
we AddInterface in that case, as we'll never bind anything to the interface
request anyway.

[leonhsl(Using Gerrit), 2016/08/29 06:12:06]

If we do not AddInterface, ERROR log "Failed to locate a binder for interface:
XXX" will be dumped by
https://cs.chromium.org/chromium/src/services/shell/public/cpp/lib/interface_...
when the request arrived. I assume we do not want this.

+                                                         std::move(request));
+  }
+}
+
+DataReductionProxyHostImpl::DataReductionProxyHostImpl(
+    base::WeakPtr<DataReductionProxyConfig> config,
+    mojom::DataReductionProxyHostRequest request)
+    : config_(config), binding_(this, std::move(request)) {}
+
+DataReductionProxyHostImpl::~DataReductionProxyHostImpl() {}
+
+void DataReductionProxyHostImpl::IsDataReductionProxy(
+    const net::HostPortPair& proxy_server,
+    const IsDataReductionProxyCallback& callback) {
+  if (!config_) {
+    callback.Run(false);
+    return;
+  }
+
+  callback.Run(config_->IsDataReductionProxy(proxy_server, nullptr));
+}
+
+}  // namespace data_reduction_proxy