Implement chrome://blob-internals with network service.

content/browser/blob_storage/blob_internals_url_loader.cc

+// Copyright 2017 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 "content/browser/blob_storage/blob_internals_url_loader.h"
+
+#include "content/browser/blob_storage/blob_internals_url_loader.h"
+#include "content/browser/blob_storage/chrome_blob_storage_context.h"
+#include "storage/browser/blob/view_blob_internals_job.h"
+
+namespace content {
+
+void StartBlobInternalsURLLoader(

[dmurph, 2017/05/09 20:45:18]

I trust this is correct - I'm unfamiliar with mojo infrastructure.

+    const ResourceRequest& request,
+    mojom::URLLoaderClientPtrInfo client_info,
+    ChromeBlobStorageContext* blob_storage_context) {
+  scoped_refptr<net::HttpResponseHeaders> headers(
+      new net::HttpResponseHeaders("HTTP/1.1 200 OK"));
+  ResourceResponseHead resource_response;
+  resource_response.headers = headers;
+  resource_response.mime_type = "text/html";
+
+  mojom::URLLoaderClientPtr client;
+  client.Bind(std::move(client_info));
+  client->OnReceiveResponse(resource_response, base::nullopt, nullptr);
+
+  std::string output = storage::ViewBlobInternalsJob::GenerateHTML(
+      blob_storage_context->context());
+
+  MojoCreateDataPipeOptions options;
+  options.struct_size = sizeof(MojoCreateDataPipeOptions);
+  options.flags = MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE;
+  options.element_num_bytes = 1;
+  options.capacity_num_bytes = output.size();
+  mojo::DataPipe data_pipe(options);
+
+  DCHECK(data_pipe.producer_handle.is_valid());
+  DCHECK(data_pipe.consumer_handle.is_valid());
+
+  void* buffer = nullptr;
+  uint32_t num_bytes = output.size();
+  MojoResult result =
+      BeginWriteDataRaw(data_pipe.producer_handle.get(), &buffer, &num_bytes,
+                        MOJO_WRITE_DATA_FLAG_NONE);
+  CHECK_EQ(result, MOJO_RESULT_OK);
+  CHECK_EQ(num_bytes, output.size());
+
+  memcpy(buffer, output.c_str(), output.size());
+  result = EndWriteDataRaw(data_pipe.producer_handle.get(), num_bytes);
+  CHECK_EQ(result, MOJO_RESULT_OK);
+
+  client->OnStartLoadingResponseBody(std::move(data_pipe.consumer_handle));
+
+  ResourceRequestCompletionStatus request_complete_data;
+  request_complete_data.error_code = net::OK;
+  request_complete_data.exists_in_cache = false;
+  request_complete_data.completion_time = base::TimeTicks::Now();
+  request_complete_data.encoded_data_length = output.size();
+  request_complete_data.encoded_body_length = output.size();
+  client->OnComplete(request_complete_data);
+}
+
+}  // namespace content