Add UMA reporting on failure to load ppapi plugins.

chrome/plugin/chrome_content_plugin_client.cc

Index: chrome/plugin/chrome_content_plugin_client.cc
diff --git a/chrome/plugin/chrome_content_plugin_client.cc b/chrome/plugin/chrome_content_plugin_client.cc
index c6712ab1502ce6003537ef020cc091626fde878f..8175f74090900f5778d9604bb98fc13670ae3883 100644
--- a/chrome/plugin/chrome_content_plugin_client.cc
+++ b/chrome/plugin/chrome_content_plugin_client.cc
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/metrics/histogram.h"
 #include "chrome/plugin/chrome_content_plugin_client.h"
+#include "third_party/widevine/cdm/widevine_cdm_common.h"
 
 #if defined(ENABLE_REMOTING)
 #include "base/files/file_path.h"
@@ -14,8 +16,8 @@
 #include "base/native_library.h"
 #elif defined(OS_POSIX) && !defined(OS_MACOSX) && defined(USE_NSS)
 #include "crypto/nss_util.h"
-#endif
-#endif
+#endif  // defined(OS_WIN)
+#endif  // defined(ENABLE_REMOTING)
 
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
@@ -23,7 +25,7 @@
 #include "base/strings/sys_string_conversions.h"
 #include "grit/chromium_strings.h"
 #include "ui/base/l10n/l10n_util.h"
-#endif
+#endif  // defined(OS_MACOSX)
 
 namespace chrome {
 
@@ -67,4 +69,14 @@ void ChromeContentPluginClient::PluginProcessStarted(
 #endif
 }
 
+void ChromeContentPluginClient::PluginLoaded(const base::FilePath& plugin_path,
+                                             PluginLoadStatus status) {
+  base::FilePath::StringType plugin_name = plugin_path.BaseName().value();
+  // TODO(xhwang): Add UMA reporting for more ppapi plugins.
+  if (plugin_name == kWidevineCdmPluginFileName) {
+    UMA_HISTOGRAM_ENUMERATION("Plugin.LoadStatus.Widevine", status,
+                              ContentPluginClient::LOAD_STATUS_MAX);
+  }
+}
+
 }  // namespace chrome