Drive: add a method to clear all local cache.

chrome/browser/chromeos/gdata/gdata_system_service.cc

Index: chrome/browser/chromeos/gdata/gdata_system_service.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_system_service.cc b/chrome/browser/chromeos/gdata/gdata_system_service.cc
index cdf10bf572e98391cd9ebc0e212f36965206f5d5..72727dbb5e0f149f33cab5bec47599f9d6acb341 100644
--- a/chrome/browser/chromeos/gdata/gdata_system_service.cc
+++ b/chrome/browser/chromeos/gdata/gdata_system_service.cc
@@ -39,7 +39,8 @@ const std::string* g_test_cache_root = NULL;
 
 GDataSystemService::GDataSystemService(Profile* profile)
     : profile_(profile),
-      cache_(NULL) {
+      cache_(NULL),
+      ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   base::SequencedWorkerPool* blocking_pool = BrowserThread::GetBlockingPool();
   blocking_task_runner_ = blocking_pool->GetSequencedTaskRunner(
@@ -103,6 +104,24 @@ void GDataSystemService::Shutdown() {
   documents_service_.reset();
 }
 
+void GDataSystemService::ClearCache() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  RemoveDriveMountPoint();
+  docs_service()->CancelAll();
+  cache_->ClearAllOnUIThread(
+      base::Bind(&GDataSystemService::AddBackDriveMountPoint,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void GDataSystemService::AddBackDriveMountPoint(
+    GDataFileError error, const FilePath& file_path) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  // TODO(yoshiki): Notify to user when |error| != GDATA_FILE_OK.

[satorux1, 2012/08/02 01:03:21]

Hmm, would it be difficult to do this now?

[yoshiki, 2012/08/02 07:12:11]

We need to think how to notify the failure to JS-side. Anyway, it is not
difficult only in the part of this CL.

On 2012/08/02 01:03:21, satorux1 wrote:

+  AddDriveMountPoint();
+}
+
 void GDataSystemService::AddDriveMountPoint() {
   if (!gdata::util::IsGDataAvailable(profile_))
     return;