Add 'Clear local data and reload' button in chrome:drive-internals.

chrome/browser/ui/webui/chromeos/drive_internals_ui.cc

Index: chrome/browser/ui/webui/chromeos/drive_internals_ui.cc
diff --git a/chrome/browser/ui/webui/chromeos/drive_internals_ui.cc b/chrome/browser/ui/webui/chromeos/drive_internals_ui.cc
index cd009b09df0f59d3bed3954c0cbb08bfafc6c313..8e110c43163e6e16cab9f26a12c0169c86139f8a 100644
--- a/chrome/browser/ui/webui/chromeos/drive_internals_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/drive_internals_ui.cc
@@ -286,11 +286,15 @@ class DriveInternalsWebUIHandler : public content::WebUIMessageHandler {
   // Called when the page requests periodic update.
   void OnPeriodicUpdate(const base::ListValue* args);
 
+  // Called when the corresponding button on the page is pressed.
   void ClearAccessToken(const base::ListValue* args);
   void ClearRefreshToken(const base::ListValue* args);
-
+  void ReloadDriveFileSystem(const base::ListValue* args);
   void ListFileEntries(const base::ListValue* args);
 
+  // Called after file system reload for ReloadDriveFileSystem is done.
+  void ReloadFinished(bool success);
+
   // The last event sent to the JavaScript side.
   int last_sent_event_id_;
 
@@ -370,6 +374,10 @@ void DriveInternalsWebUIHandler::RegisterMessages() {
       base::Bind(&DriveInternalsWebUIHandler::ClearRefreshToken,
                  weak_ptr_factory_.GetWeakPtr()));
   web_ui()->RegisterMessageCallback(
+      "reloadDriveFileSystem",
+      base::Bind(&DriveInternalsWebUIHandler::ReloadDriveFileSystem,
+                 weak_ptr_factory_.GetWeakPtr()));
+  web_ui()->RegisterMessageCallback(
       "listFileEntries",
       base::Bind(&DriveInternalsWebUIHandler::ListFileEntries,
                  weak_ptr_factory_.GetWeakPtr()));
@@ -559,6 +567,26 @@ void DriveInternalsWebUIHandler::ClearRefreshToken(
     drive_service->ClearRefreshToken();
 }
 
+void DriveInternalsWebUIHandler::ReloadDriveFileSystem(
+    const base::ListValue* args) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  drive::DriveIntegrationService* integration_service =
+      GetIntegrationService();
+  if (integration_service) {
+    integration_service->ClearCacheAndRemountFileSystem(
+        base::Bind(&DriveInternalsWebUIHandler::ReloadFinished,
+                   weak_ptr_factory_.GetWeakPtr()));
+  }
+}
+
+void DriveInternalsWebUIHandler::ReloadFinished(bool success) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  web_ui()->CallJavascriptFunction("updateReloadStatus",
+                                   base::FundamentalValue(success));
+}
+
 void DriveInternalsWebUIHandler::ListFileEntries(const base::ListValue* args) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));