Report PPAPI plugin load error code to UMA.

content/zygote/zygote_main_linux.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/zygote/zygote_main.h"
 
 #include <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
@@ skipping 274 matching lines @@
 
 #if defined(ENABLE_PLUGINS)
 // Loads the (native) libraries but does not initialize them (i.e., does not
 // call PPP_InitializeModule). This is needed by the zygote on Linux to get
 // access to the plugins before entering the sandbox.
 void PreloadPepperPlugins() {
   std::vector<PepperPluginInfo> plugins;
   ComputePepperPluginList(&plugins);
   for (size_t i = 0; i < plugins.size(); ++i) {
     if (!plugins[i].is_internal && plugins[i].is_sandboxed) {
-      std::string error;
+      base::NativeLibraryLoadError error;
       base::NativeLibrary library = base::LoadNativeLibrary(plugins[i].path,
                                                             &error);
       VLOG_IF(1, !library) << "Unable to load plugin "
                            << plugins[i].path.value() << " "
-                           << error;
+                           << error.ToString();
 
       (void)library;  // Prevent release-mode warning.
     }
   }
 }
 #endif
 
 // This function triggers the static and lazy construction of objects that need
 // to be created before imposing the sandbox.
 static void ZygotePreSandboxInit() {
@@ skipping 155 matching lines @@
   EnterLayerOneSandbox(linux_sandbox);
 
   int sandbox_flags = linux_sandbox->GetStatus();
 
   Zygote zygote(sandbox_flags, forkdelegate);
   // This function call can return multiple times, once per fork().
   return zygote.ProcessRequests();
 }
 
 }  // namespace content