Drive: add a method to clear all local cache.

chrome/browser/chromeos/gdata/gdata_cache.h

Index: chrome/browser/chromeos/gdata/gdata_cache.h
diff --git a/chrome/browser/chromeos/gdata/gdata_cache.h b/chrome/browser/chromeos/gdata/gdata_cache.h
index 5aa8a06cb2faf4902a24425d1e43273a3d7d307c..849c3e69ccc416f9d8853f63445ab096a544c59f 100644
--- a/chrome/browser/chromeos/gdata/gdata_cache.h
+++ b/chrome/browser/chromeos/gdata/gdata_cache.h
@@ -263,6 +263,11 @@ class GDataCache {
   void RemoveOnUIThread(const std::string& resource_id,
                         const CacheOperationCallback& callback);
 
+  // Does the following:
+  // - remove all the files in the cache directory.
+  // - re-create the |metadata_| instance.
+  void ClearAllOnUIThread(const SetMountedStateCallback& callback);

[satorux1, 2012/08/01 20:50:31]

The callback type name looks awkward for this function. Maybe rename it to
something more generic, like ChangeCacheStateCallback?

[yoshiki, 2012/08/01 21:44:59]

Done.

+
   // Utility method to call Initialize on UI thread.
   void RequestInitializeOnUIThread();
 
@@ -396,6 +401,9 @@ class GDataCache {
   void Remove(const std::string& resource_id,
               GDataFileError* error);
 
+  // Used to implement ClearAllUIThread.
+  void ClearAll(GDataFileError* error);
+
   // Runs callback and notifies the observers when file is pinned.
   void OnPinned(GDataFileError* error,
                 const std::string& resource_id,