Add the scheme chrome-distiller:// and hook up data source.

components/dom_distiller/content/dom_distiller_viewer_source.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 "components/dom_distiller/content/dom_distiller_viewer_source.h"
+
+#include <string>
+
+#include "base/memory/ref_counted_memory.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_view_host.h"
+#include "net/url_request/url_request.h"
+#include "url/gurl.h"
+
+namespace dom_distiller {
+
+DomDistillerViewerSource::DomDistillerViewerSource(const std::string& scheme)
+    : scheme_(scheme) {}
+
+DomDistillerViewerSource::~DomDistillerViewerSource() {}
+
+std::string DomDistillerViewerSource::GetSource() const { return scheme_; }
+
+void DomDistillerViewerSource::StartDataRequest(
+    const std::string& path,
+    int render_process_id,
+    int render_frame_id,
+    const content::URLDataSource::GotDataCallback& callback) {
+  content::RenderFrameHost* render_frame_host =
+      content::RenderFrameHost::FromID(render_process_id, render_frame_id);
+  DCHECK(render_frame_host);
+  content::RenderViewHost* render_view_host =
+      render_frame_host->GetRenderViewHost();
+  DCHECK(render_view_host);
+  CHECK_EQ(0, render_view_host->GetEnabledBindings());
+
+  std::string page_template = "Aloha!";
+  callback.Run(base::RefCountedString::TakeString(&page_template));
+};
+
+std::string DomDistillerViewerSource::GetMimeType(const std::string& path)
+    const {
+  return "text/plain";
+}
+
+bool DomDistillerViewerSource::ShouldServiceRequest(
+    const net::URLRequest* request) const {
+  return request->url().SchemeIs(scheme_.c_str());
+}
+
+}  // namespace dom_distiller