Drive: Adds clearDriveCache API to file_browser_private.

chrome/browser/chromeos/extensions/file_browser_private_api.h

Index: chrome/browser/chromeos/extensions/file_browser_private_api.h
diff --git a/chrome/browser/chromeos/extensions/file_browser_private_api.h b/chrome/browser/chromeos/extensions/file_browser_private_api.h
index 9b175fdd009d5cd3ae27ae8abe022b5b58e9dfb2..c612e0bea20ee00ec09af1f79ebb363cda8f03de 100644
--- a/chrome/browser/chromeos/extensions/file_browser_private_api.h
+++ b/chrome/browser/chromeos/extensions/file_browser_private_api.h
@@ -675,6 +675,16 @@ 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: