Add DataReductionProxy IPC to determine if the Data Reduction Proxy was used.

components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.cc

Index: components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.cc
diff --git a/components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.cc b/components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d19889862594118be60238bef130eeb6324bb251
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+++ b/components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.cc
@@ -0,0 +1,53 @@
+// Copyright 2015 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_message_filter.h"
+
+#include "components/data_reduction_proxy/content/common/data_reduction_proxy_messages.h"
+#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h"
+#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
+#include "content/public/browser/browser_thread.h"
+#include "ipc/ipc_message_macros.h"
+#include "net/base/host_port_pair.h"
+
+namespace data_reduction_proxy {
+
+DataReductionProxyMessageFilter::DataReductionProxyMessageFilter(
+    DataReductionProxySettings* settings)
+    : BrowserMessageFilter(DataReductionProxyStart),
+      config_(nullptr) {
+  if (settings != nullptr)

[bengr, 2015/02/26 22:52:52]

Why is this not a DCHECK?

[jeremyim, 2015/02/27 04:38:40]

Done.

+    config_ = settings->Config();
+}
+
+DataReductionProxyMessageFilter::~DataReductionProxyMessageFilter() {}

[bengr, 2015/02/26 22:52:52]

Move close curly to next line.

[jeremyim, 2015/02/27 04:38:40]

Done.

+
+bool DataReductionProxyMessageFilter::OnMessageReceived(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(DataReductionProxyMessageFilter, message)
+    IPC_MESSAGE_HANDLER(DataReductionProxyViewHostMsg_WasDataReductionProxyUsed,
+                        OnWasDataReductionProxyUsed)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void DataReductionProxyMessageFilter::OverrideThreadForMessage(
+    const IPC::Message& message, content::BrowserThread::ID* thread) {
+  if (message.type() ==
+      DataReductionProxyViewHostMsg_WasDataReductionProxyUsed::ID)

[bengr, 2015/02/26 22:52:52]

Indent 4 and enclose the next line in braces.

[jeremyim, 2015/02/27 04:38:40]

Done.

+      *thread = content::BrowserThread::IO;
+}
+
+void DataReductionProxyMessageFilter::OnWasDataReductionProxyUsed(
+    const net::HostPortPair& proxy_server, bool* response) {
+  if (config_) {

[bengr, 2015/02/26 22:52:52]

These don't need curly braces.

[jeremyim, 2015/02/27 04:38:40]

Done.

+    *response = config_->IsDataReductionProxy(proxy_server, nullptr);
+  } else {
+    *response = false;
+  }
+}
+
+}  // namespace data_reduction_proxy