Implement improvements for request handling (issue #1327).

- Add a new CefRequestHandler::OnResourceResponse() method for inspecting the request/response headers and potentially restarting or redirecting the request.
- Add a new CefRequest::GetIdentifier() method for tracking a request across multiple CefRequestHandler callbacks.
- Pass a CefRequest object instead of just the old URL to CefRequestHandler::OnResourceRedirect().

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@2073 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/common/response_impl.cc

@@ -10,6 +10,7 @@
 #include "base/strings/stringprintf.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_response_headers.h"
+#include "net/url_request/url_request.h"
 #include "third_party/WebKit/public/platform/WebHTTPHeaderVisitor.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
@@ -152,6 +153,7 @@ net::HttpResponseHeaders* CefResponseImpl::GetResponseHeaders() {
 void CefResponseImpl::SetResponseHeaders(
     const net::HttpResponseHeaders& headers) {
   base::AutoLock lock_scope(lock_);
+  CHECK_READONLY_RETURN_VOID();
 
   header_map_.empty();
 
@@ -166,6 +168,8 @@ void CefResponseImpl::SetResponseHeaders(
   std::string mime_type;
   if (headers.GetMimeType(&mime_type))
     mime_type_ = mime_type;
+  else
+    mime_type_.clear();
 }
 
 void CefResponseImpl::Set(const blink::WebURLResponse& response) {
@@ -199,6 +203,14 @@ void CefResponseImpl::Set(const blink::WebURLResponse& response) {
   response.visitHTTPHeaderFields(&visitor);
 }
 
+void CefResponseImpl::Set(const net::URLRequest* request) {
+  DCHECK(request);
+
+  const net::HttpResponseHeaders* headers = request->response_headers();
+  if (headers)
+    SetResponseHeaders(*headers);
+}
+
 void CefResponseImpl::SetReadOnly(bool read_only) {
   base::AutoLock lock_scope(lock_);
   read_only_ = read_only;