Use FakeServer-based invalidations for Sync tests

sync/test/fake_server/fake_server_http_post_provider.h

Index: sync/test/fake_server/fake_server_http_post_provider.h
diff --git a/sync/test/fake_server/fake_server_http_post_provider.h b/sync/test/fake_server/fake_server_http_post_provider.h
index 63f1eda2b277720569a1018ddf54178cfcd2ce74..9e2aa0e9ba383a77599400ca1b199003dedb1a5e 100644
--- a/sync/test/fake_server/fake_server_http_post_provider.h
+++ b/sync/test/fake_server/fake_server_http_post_provider.h
@@ -8,6 +8,8 @@
 #include <string>
 
 #include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
+#include "base/synchronization/waitable_event.h"
 #include "sync/internal_api/public/http_post_provider_factory.h"
 #include "sync/internal_api/public/http_post_provider_interface.h"
 
@@ -19,7 +21,9 @@ class FakeServerHttpPostProvider
     : public syncer::HttpPostProviderInterface,
       public base::RefCountedThreadSafe<FakeServerHttpPostProvider> {
  public:
-  explicit FakeServerHttpPostProvider(FakeServer* fake_server);
+  explicit FakeServerHttpPostProvider(
+      FakeServer* fake_server,
+      scoped_refptr<base::SequencedTaskRunner> task_runner);
 
   // HttpPostProviderInterface implementation.
   virtual void SetExtraRequestHeaders(const char* headers) OVERRIDE;
@@ -39,13 +43,22 @@ class FakeServerHttpPostProvider
   virtual ~FakeServerHttpPostProvider();
 
  private:
+  void OnPostComplete(int error_code,
+                      int response_code,
+                      const std::string& response);
+
   FakeServer* const fake_server_;
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+
   std::string response_;
   std::string request_url_;
   int request_port_;
   std::string request_content_;
   std::string request_content_type_;
   std::string extra_request_headers_;
+  int post_error_code_;
+  int post_response_code_;
+  base::WaitableEvent post_complete_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeServerHttpPostProvider);
 };
@@ -53,7 +66,9 @@ class FakeServerHttpPostProvider
 class FakeServerHttpPostProviderFactory
     : public syncer::HttpPostProviderFactory {
  public:
-  explicit FakeServerHttpPostProviderFactory(FakeServer* fake_server);
+  explicit FakeServerHttpPostProviderFactory(
+      FakeServer* fake_server,
+      scoped_refptr<base::SequencedTaskRunner> task_runner);
   virtual ~FakeServerHttpPostProviderFactory();
 
   // HttpPostProviderFactory:
@@ -63,6 +78,7 @@ class FakeServerHttpPostProviderFactory
 
  private:
   FakeServer* const fake_server_;
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeServerHttpPostProviderFactory);
 };