Drive: Adds clearDriveCache API to file_browser_private.

This API is to clear all the local cache of Drive.

BUG=135197
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10837091

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149949 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/extensions/file_browser_private_api.cc

@@ -2365,6 +2365,21 @@ void SearchDriveFunction::OnSearch(
   SendResponse(true);
 }
 
+bool ClearDriveCacheFunction::RunImpl() {
+  gdata::GDataSystemService* system_service =
+      gdata::GDataSystemServiceFactory::GetForProfile(profile_);
+  // |system_service| is NULL if incognito window / guest login.
+  if (!system_service || !system_service->file_system())
+    return false;
+
+  // TODO(yoshiki): Receive a callback from JS-side and pass it to
+  // ClearCacheAndRemountFileSystem(). http://crbug.com/140511
+  system_service->ClearCacheAndRemountFileSystem(base::Callback<void(bool)>());
+
+  SendResponse(true);
+  return true;
+}
+
 bool GetNetworkConnectionStateFunction::RunImpl() {
   chromeos::NetworkLibrary* network_library =
       chromeos::CrosLibrary::Get()->GetNetworkLibrary();

chrome/browser/chromeos/extensions/file_browser_private_api.h

@@ -670,6 +670,16 @@ class SearchDriveFunction : public AsyncExtensionFunction {
   GURL file_system_url_;
 };
 
+class ClearDriveCacheFunction : public AsyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION_NAME("fileBrowserPrivate.clearDriveCache");
+
+ protected:
+  virtual ~ClearDriveCacheFunction() {}
+
+  virtual bool RunImpl() OVERRIDE;
+};
+
 // Implements the chrome.fileBrowserPrivate.getNetworkConnectionState method.
 class GetNetworkConnectionStateFunction : public SyncExtensionFunction {
  public:

chrome/browser/extensions/extension_function_registry.cc

@@ -376,6 +376,7 @@ void ExtensionFunctionRegistry::ResetFunctions() {
   RegisterFunction<GetGDataPreferencesFunction>();
   RegisterFunction<SetGDataPreferencesFunction>();
   RegisterFunction<SearchDriveFunction>();
+  RegisterFunction<ClearDriveCacheFunction>();
   RegisterFunction<GetNetworkConnectionStateFunction>();
   RegisterFunction<RequestDirectoryRefreshFunction>();
 

chrome/common/extensions/api/file_browser_private.json

@@ -944,6 +944,11 @@
           }
         ]
       },
+      {
+        "name": "clearDriveCache",
+        "description": "Clear all GData local caches.",
+        "parameters": []
+      },
       {
         "name": "getNetworkConnectionState",
         "description": "Retrieves the state of the currently active network connection.",