chromeos: Add logging to pepper plugin loading.

content/common/pepper_plugin_registry.cc

Index: content/common/pepper_plugin_registry.cc
diff --git a/content/common/pepper_plugin_registry.cc b/content/common/pepper_plugin_registry.cc
index be7529d7f98dd09d169faa33a30e12f56348d53c..7ab10bdf820407cdd28a03bd580501ec95b47769 100644
--- a/content/common/pepper_plugin_registry.cc
+++ b/content/common/pepper_plugin_registry.cc
@@ -137,6 +137,11 @@ void PepperPluginRegistry::PreloadModules() {
       std::string error;
       base::NativeLibrary library = base::LoadNativeLibrary(plugins[i].path,
                                                             &error);
+#if defined(OS_CHROMEOS)
+      // TODO(xiyuan): Remove this once crosbug.com/26646 is resolved.
+      LOG(ERROR) << "#### PepperPluginRegistry::PreloadModules"
+                 << ", path=" << plugins[i].path.value();
+#endif  // defined (OS_CHROMEOS)
       DLOG_IF(WARNING, !library) << "Unable to load plugin "
                                  << plugins[i].path.value() << " "
                                  << error;