sync: Add GetAllSyncData to sync/api

chrome/browser/sync/glue/generic_change_processor_unittest.cc

Index: chrome/browser/sync/glue/generic_change_processor_unittest.cc
diff --git a/chrome/browser/sync/glue/generic_change_processor_unittest.cc b/chrome/browser/sync/glue/generic_change_processor_unittest.cc
index 27bda381aa83e285bd54f80e0ff7b4b14a114464..74c3409764f52ab80fdaec7d3ed4a7c75a554d1d 100644
--- a/chrome/browser/sync/glue/generic_change_processor_unittest.cc
+++ b/chrome/browser/sync/glue/generic_change_processor_unittest.cc
@@ -111,6 +111,23 @@ TEST_F(SyncGenericChangeProcessorTest, StressGetSyncDataForType) {
   }
 }
 
+// Similar to above, but focused on the method that implements sync/api
+// interfaces and is hence exposed to datatypes directly.
+TEST_F(SyncGenericChangeProcessorTest, StressGetAllSyncData) {
+  const int kNumChildNodes = 1000;
+  const int kRepeatCount = 1;
+
+  ASSERT_NO_FATAL_FAILURE(BuildChildNodes(kNumChildNodes));
+
+  for (int i = 0; i < kRepeatCount; ++i) {
+    syncer::SyncDataList sync_data =
+        change_processor()->GetAllSyncData(kType);
+
+    // Start with a simple test.  We can add more in-depth testing later.
+    EXPECT_EQ(static_cast<size_t>(kNumChildNodes), sync_data.size());
+  }
+}
+
 TEST_F(SyncGenericChangeProcessorTest, SetGetPasswords) {
   const int kNumPasswords = 10;
   sync_pb::PasswordSpecificsData password_data;