Roll Chrome into Mojo.

net/url_request/url_request_simple_job.cc

 // Copyright (c) 2012 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 "net/url_request/url_request_simple_job.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/profiler/scoped_tracker.h"
+#include "base/threading/worker_pool.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_util.h"
 #include "net/url_request/url_request_status.h"
 
 namespace net {
 
-URLRequestSimpleJob::URLRequestSimpleJob(
-    URLRequest* request, NetworkDelegate* network_delegate)
+namespace {
+
+void CopyData(const scoped_refptr<IOBuffer>& buf,
+              int buf_size,
+              const scoped_refptr<base::RefCountedMemory>& data,
+              int64 data_offset) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422489 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("422489 CopyData"));
+
+  memcpy(buf->data(), data->front() + data_offset, buf_size);
+}
+
+}  // namespace
+
+URLRequestSimpleJob::URLRequestSimpleJob(URLRequest* request,
+                                         NetworkDelegate* network_delegate)
     : URLRangeRequestJob(request, network_delegate),
-      data_offset_(0),
-      weak_factory_(this) {}
+      next_data_offset_(0),
+      task_runner_(base::WorkerPool::GetTaskRunner(false)),
+      weak_factory_(this) {
+}
 
 void URLRequestSimpleJob::Start() {
   // Start reading asynchronously so that all error reporting and data
   // callbacks happen as they would for network requests.
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&URLRequestSimpleJob::StartAsync, weak_factory_.GetWeakPtr()));
 }
 
 bool URLRequestSimpleJob::GetMimeType(std::string* mime_type) const {
   *mime_type = mime_type_;
   return true;
 }
 
 bool URLRequestSimpleJob::GetCharset(std::string* charset) {
   *charset = charset_;
   return true;
 }
 
 URLRequestSimpleJob::~URLRequestSimpleJob() {}
 
 bool URLRequestSimpleJob::ReadRawData(IOBuffer* buf, int buf_size,
                                       int* bytes_read) {
   // TODO(vadimt): Remove ScopedTracker below once crbug.com/422489 is fixed.
   tracked_objects::ScopedTracker tracking_profile(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "422489 URLRequestSimpleJob::ReadRawData"));
 
   DCHECK(bytes_read);
-  buf_size = static_cast<int>(std::min(
-      static_cast<int64>(buf_size),
-      byte_range_.last_byte_position() - data_offset_ + 1));
-  memcpy(buf->data(), data_->front() + data_offset_, buf_size);
-  data_offset_ += buf_size;
-  *bytes_read = buf_size;
-  return true;
+  buf_size = static_cast<int>(
+      std::min(static_cast<int64>(buf_size),
+               byte_range_.last_byte_position() - next_data_offset_ + 1));
+  DCHECK_GE(buf_size, 0);
+  if (buf_size == 0) {
+    *bytes_read = 0;
+    return true;
+  }
+
+  // Do memory copy on a background thread. See crbug.com/422489.
+  GetTaskRunner()->PostTaskAndReply(
+      FROM_HERE, base::Bind(&CopyData, make_scoped_refptr(buf), buf_size, data_,
+                            next_data_offset_),
+      base::Bind(&URLRequestSimpleJob::OnReadCompleted,
+                 weak_factory_.GetWeakPtr(), buf_size));
+  next_data_offset_ += buf_size;
+  SetStatus(net::URLRequestStatus(net::URLRequestStatus::IO_PENDING, 0));
+  return false;
+}
+
+void URLRequestSimpleJob::OnReadCompleted(int bytes_read) {
+  SetStatus(net::URLRequestStatus());
+  NotifyReadComplete(bytes_read);
+}
+
+base::TaskRunner* URLRequestSimpleJob::GetTaskRunner() const {
+  return task_runner_.get();
 }
 
 int URLRequestSimpleJob::GetData(std::string* mime_type,
                                  std::string* charset,
                                  std::string* data,
                                  const CompletionCallback& callback) const {
   NOTREACHED();
   return ERR_UNEXPECTED;
 }
 
@@ skipping 57 matching lines @@
           "422489 URLRequestSimpleJob::OnGetDataCompleted"));
 
   if (result == OK) {
     // Notify that the headers are complete
     if (!byte_range_.ComputeBounds(data_->size())) {
       NotifyDone(URLRequestStatus(URLRequestStatus::FAILED,
                  ERR_REQUEST_RANGE_NOT_SATISFIABLE));
       return;
     }
 
-    data_offset_ = byte_range_.first_byte_position();
-    set_expected_content_size(
-        byte_range_.last_byte_position() - data_offset_ + 1);
+    next_data_offset_ = byte_range_.first_byte_position();
+    set_expected_content_size(byte_range_.last_byte_position() -
+                              next_data_offset_ + 1);
     NotifyHeadersComplete();
   } else {
     NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED, result));
   }
 }
 
 }  // namespace net