Introduce WebRequestEventRouterDelegate.

extensions/browser/api/web_request/web_request_api_helpers.cc

Index: extensions/browser/api/web_request/web_request_api_helpers.cc
diff --git a/extensions/browser/api/web_request/web_request_api_helpers.cc b/extensions/browser/api/web_request/web_request_api_helpers.cc
index 29de9b6953e037cddb4932061fa54f1ae5b65a0b..a4d14f3768de15927f916b684abb81e83a4746d4 100644
--- a/extensions/browser/api/web_request/web_request_api_helpers.cc
+++ b/extensions/browser/api/web_request/web_request_api_helpers.cc
@@ -15,6 +15,7 @@
 #include "components/web_cache/browser/web_cache_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
+#include "extensions/browser/api/web_request/web_request_api_constants.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/extensions_browser_client.h"
@@ -35,6 +36,8 @@ using base::Time;
 using net::cookie_util::ParsedRequestCookie;
 using net::cookie_util::ParsedRequestCookies;
 
+namespace keys = extension_web_request_api_constants;
+
 namespace extension_web_request_api_helpers {
 
 namespace {
@@ -1199,4 +1202,19 @@ void SendExtensionWebRequestStatusToHost(content::RenderProcessHost* host) {
   host->Send(new ExtensionMsg_UsingWebRequestAPI(webrequest_used));
 }
 
+// Converts the |name|, |value| pair of a http header to a HttpHeaders
+// dictionary. Ownership is passed to the caller.
+base::DictionaryValue* ToHeaderDictionary(const std::string& name,

[Ken Rockot(use gerrit already), 2014/09/19 20:52:27]

How about CreateHeaderDictionary or MakeHeaderDictionary? "To" prefixes usually
imply type conversion and this isn't quite type conversion.

[Xi Han, 2014/09/19 22:05:55]

Change to CreateHeaderDictionary.

+                                          const std::string& value) {
+  base::DictionaryValue* header = new base::DictionaryValue();
+  header->SetString(keys::kHeaderNameKey, name);
+  if (base::IsStringUTF8(value)) {
+    header->SetString(keys::kHeaderValueKey, value);
+  } else {
+    header->Set(keys::kHeaderBinaryValueKey,
+                StringToCharList(value));
+  }
+  return header;
+}
+
 }  // namespace extension_web_request_api_helpers