[Sync] Initial support for encrypting any datatype (no UI hookup yet).

chrome/browser/sync/syncable/model_type.cc

Index: chrome/browser/sync/syncable/model_type.cc
diff --git a/chrome/browser/sync/syncable/model_type.cc b/chrome/browser/sync/syncable/model_type.cc
index 1aea654fbcc8bf2a191ec4075b7b0843da007bc0..97c4a3ddbc59e5d4dba39410cdf79db09fbb961e 100644
--- a/chrome/browser/sync/syncable/model_type.cc
+++ b/chrome/browser/sync/syncable/model_type.cc
@@ -255,6 +255,39 @@ bool ModelTypeBitSetFromString(
   return iss.eof();
 }
 
+// TODO(zea): remove all hardcoded tags in model associators and have them use
+// this instead.
+std::string ModelTypeToRootTag(ModelType type) {
+  switch (type) {
+    case BOOKMARKS:
+      return "google_chrome_bookmarks";
+    case PREFERENCES:
+      return "google_chrome_preferences";
+    case PASSWORDS:
+      return "google_chrome_passwords";
+    case AUTOFILL:
+      return "google_chrome_autofill";
+    case THEMES:
+      return "google_chrome_themes";
+    case TYPED_URLS:
+      return "google_chrome_typed_urls";
+    case EXTENSIONS:
+      return "google_chrome_extensions";
+    case NIGORI:
+      return "google_chrome_nigori";
+    case SESSIONS:
+      return "google_chrome_sessions";
+    case APPS:
+      return "google_chrome_apps";
+    case AUTOFILL_PROFILE:
+      return "google_chrome_autofill_profiles";
+    default:
+      break;
+  }
+  NOTREACHED() << "No known extension for model type.";
+  return "INVALID";
+}
+
 // For now, this just implements UMA_HISTOGRAM_LONG_TIMES. This can be adjusted
 // if we feel the min, max, or bucket count amount are not appropriate.
 #define SYNC_FREQ_HISTOGRAM(name, time) UMA_HISTOGRAM_CUSTOM_TIMES( \