[File Manager] Show thumbnails for GData files

Thumbnails are now available for GData files everywhere (preview pane, grid view, Gallery). Gallery opens and displays images but cannot edit yet.

For this to work I had to fix the recently added chrome.fileBrowserPrivate.getGDataFileProperties implementation.

BUG=chromium-os:27133
TEST=

Review URL: https://chromiumcodereview.appspot.com/9595015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@125136 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_function_dispatcher.cc b/chrome/browser/extensions/extension_function_dispatcher.cc
index 051be49..36500b02 100644
--- a/chrome/browser/extensions/extension_function_dispatcher.cc
+++ b/chrome/browser/extensions/extension_function_dispatcher.cc
@@ -412,6 +412,8 @@
   RegisterFunction<ViewFilesFunction>();
   RegisterFunction<ToggleFullscreenFunction>();
   RegisterFunction<IsFullscreenFunction>();
+  RegisterFunction<GetGDataFilePropertiesFunction>();
+  RegisterFunction<PinGDataFileFunction>();
 
   // Mediaplayer
   RegisterFunction<PlayMediaplayerFunction>();