Use FakeServer-based invalidations for Sync tests (try #2)

sync/test/fake_server/fake_server_http_post_provider.cc

 // Copyright 2014 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 "sync/test/fake_server/fake_server_http_post_provider.h"
 
 #include <string>
 
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
+#include "base/synchronization/waitable_event.h"
 #include "sync/test/fake_server/fake_server.h"
 
 using syncer::HttpPostProviderInterface;
 
 namespace fake_server {
 
 FakeServerHttpPostProviderFactory::FakeServerHttpPostProviderFactory(
-    FakeServer* fake_server) : fake_server_(fake_server) { }
+    FakeServer* fake_server,
+    scoped_refptr<base::SequencedTaskRunner> task_runner)
+        : fake_server_(fake_server), task_runner_(task_runner) { }
 
 FakeServerHttpPostProviderFactory::~FakeServerHttpPostProviderFactory() { }
 
 void FakeServerHttpPostProviderFactory::Init(const std::string& user_agent) { }
 
 HttpPostProviderInterface* FakeServerHttpPostProviderFactory::Create() {
   FakeServerHttpPostProvider* http =
-      new FakeServerHttpPostProvider(fake_server_);
+      new FakeServerHttpPostProvider(fake_server_, task_runner_);
   http->AddRef();
   return http;
 }
 
 void FakeServerHttpPostProviderFactory::Destroy(
     HttpPostProviderInterface* http) {
   static_cast<FakeServerHttpPostProvider*>(http)->Release();
 }
 
 FakeServerHttpPostProvider::FakeServerHttpPostProvider(
-    FakeServer* fake_server) : fake_server_(fake_server) { }
+    FakeServer* fake_server,
+    scoped_refptr<base::SequencedTaskRunner> task_runner)
+        : fake_server_(fake_server),
+          task_runner_(task_runner),
+          post_complete_(false, false) { }
 
 FakeServerHttpPostProvider::~FakeServerHttpPostProvider() { }
 
 void FakeServerHttpPostProvider::SetExtraRequestHeaders(const char* headers) {
   // TODO(pvalenzuela): Add assertions on this value.
   extra_request_headers_.assign(headers);
 }
 
 void FakeServerHttpPostProvider::SetURL(const char* url, int port) {
   // TODO(pvalenzuela): Add assertions on these values.
   request_url_.assign(url);
   request_port_ = port;
 }
 
 void FakeServerHttpPostProvider::SetPostPayload(const char* content_type,
                                                 int content_length,
                                                 const char* content) {
   request_content_type_.assign(content_type);
   request_content_.assign(content, content_length);
 }
 
+void FakeServerHttpPostProvider::OnPostComplete(int error_code,
+                                                int response_code,
+                                                const std::string& response) {
+  post_error_code_ = error_code;
+  post_response_code_ = response_code;
+  response_ = response;
+  post_complete_.Signal();
+}
+
 bool FakeServerHttpPostProvider::MakeSynchronousPost(int* error_code,
                                                      int* response_code) {
-  // This assumes that a POST is being made to /command.
-  *error_code = fake_server_->HandleCommand(request_content_,
-                                            response_code,
-                                            &response_);
-  return (*error_code == 0);
+  // It is assumed that a POST is being made to /command.
+  FakeServer::HandleCommandCallback callback = base::Bind(
+      &FakeServerHttpPostProvider::OnPostComplete, base::Unretained(this));
+  task_runner_->PostNonNestableTask(FROM_HERE,
+                                    base::Bind(&FakeServer::HandleCommand,
+                                               base::Unretained(fake_server_),
+                                               base::ConstRef(request_content_),
+                                               base::ConstRef(callback)));
+  post_complete_.Wait();
+  *error_code = post_error_code_;
+  *response_code = post_response_code_;
+  return *error_code == 0;
 }
 
 int FakeServerHttpPostProvider::GetResponseContentLength() const {
   return response_.length();
 }
 
 const char* FakeServerHttpPostProvider::GetResponseContent() const {
   return response_.c_str();
 }
 
 const std::string FakeServerHttpPostProvider::GetResponseHeaderValue(
     const std::string& name) const {
   return std::string();
 }
 
 void FakeServerHttpPostProvider::Abort() {
 }
 
 }  // namespace fake_server