Offload disk accesses to WorkerPool in ExtensionProtocolHandler

and URLRequestResourceBundleJob.

To achieve that URLRequestSimpleJob::GetData() signature changed
to allow async operation finishing. All places implementing GetData()
are updated.


Patch from Pavel Ivanov <paivanof@gmail.com>

BUG=59849,90207

Review URL: https://chromiumcodereview.appspot.com/10696135

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@147869 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 7 insertions, 4 deletions

diff --git a/content/browser/histogram_internals_request_job.cc b/content/browser/histogram_internals_request_job.cc
index 6614642..8989210 100644
--- a/content/browser/histogram_internals_request_job.cc
+++ b/content/browser/histogram_internals_request_job.cc
@@ -9,6 +9,7 @@
 #include "content/browser/histogram_synchronizer.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/escape.h"
+#include "net/base/net_errors.h"
 #include "net/url_request/url_request.h"
 
 namespace content {
@@ -59,15 +60,17 @@ void AboutHistogram(std::string* data, const std::string& path) {
   base::StatisticsRecorder::WriteHTMLGraph(unescaped_query, data);
 }
 
-bool HistogramInternalsRequestJob::GetData(std::string* mime_type,
-                                           std::string* charset,
-                                           std::string* data) const {
+int HistogramInternalsRequestJob::GetData(
+    std::string* mime_type,
+    std::string* charset,
+    std::string* data,
+    const net::CompletionCallback& callback) const {
   mime_type->assign("text/html");
   charset->assign("UTF8");
 
   data->clear();
   AboutHistogram(data, path_);
-  return true;
+  return net::OK;
 }
 
 }  // namespace content