Disable partial swaps for webview guest renderer until we can figure out how to do that properly.

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 5e64ff8d944965be51372fd60bd8612e18d56700..24ab7e839b08558f822dc1a891d0b92822cf7dea 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -90,6 +90,8 @@ BrowserPluginGuest::BrowserPluginGuest(
   // update the BrowserPlugin's corresponding 'name' attribute.
   // TODO(fsamuel): Remove this once http://crbug.com/169110 is addressed.
   renderer_prefs->report_frame_name_changes = true;
+  // BrowserPlugin compositing does not currently work with partial swaps.
+  renderer_prefs->allow_partial_swap = false;
   // Navigation is disabled in Chrome Apps. We want to make sure guest-initiated
   // navigations still continue to function inside the app.
   renderer_prefs->browser_handles_all_top_level_requests = false;