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 29b27ce30336912a7e74f06444a5f8a1c4e1ac3a..bfc897249b23cb1d0aaec2104f0deeb2520f923f 100644
--- a/chrome/browser/chromeos/extensions/file_browser_private_api.h
+++ b/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: