Add UMA reporting on failure to load ppapi plugins.

content/ppapi_plugin/ppapi_thread.h

Index: content/ppapi_plugin/ppapi_thread.h
diff --git a/content/ppapi_plugin/ppapi_thread.h b/content/ppapi_plugin/ppapi_thread.h
index 0e21d5611ea7b5cfd8e17b5ebd9dc7d3bb8a6a5b..d5603bea698aae6919d07c801016b6ba4dfae484 100644
--- a/content/ppapi_plugin/ppapi_thread.h
+++ b/content/ppapi_plugin/ppapi_thread.h
@@ -15,6 +15,7 @@
 #include "base/scoped_native_library.h"
 #include "build/build_config.h"
 #include "content/common/child_thread.h"
+#include "content/public/plugin/content_plugin_client.h"
 #include "ipc/ipc_listener.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/trusted/ppp_broker.h"
@@ -113,6 +114,9 @@ class PpapiThread : public ChildThread,
   // Sets up the name of the plugin for logging using the given path.
   void SavePluginName(const base::FilePath& path);
 
+  void ReportLoadResult(const base::FilePath& path,
+                        ContentPluginClient::PluginLoadResult result);
+
   // True if running in a broker process rather than a normal plugin process.
   bool is_broker_;