Add version info in Widevine CDM description.

BUG=409119
TEST=Tested on Linux and Windows.

Review URL: https://codereview.chromium.org/516103004

Cr-Commit-Position: refs/heads/master@{#292739}

chrome/browser/component_updater/widevine_cdm_component_installer.cc

@@ -126,7 +126,9 @@ bool MakeWidevineCdmPluginInfo(
   plugin_info->is_out_of_process = true;
   plugin_info->path = path;
   plugin_info->name = kWidevineCdmDisplayName;
-  plugin_info->description = kWidevineCdmDescription;
+  plugin_info->description = kWidevineCdmDescription +
+                             std::string(" (version: ") + version.GetString() +
+                             ")";
   plugin_info->version = version.GetString();
   content::WebPluginMimeType widevine_cdm_mime_type(
       kWidevineCdmPluginMimeType,

chrome/common/chrome_content_client.cc

@@ -262,7 +262,9 @@ void ComputeBuiltInPlugins(std::vector<content::PepperPluginInfo>* plugins) {
       widevine_cdm.is_out_of_process = true;
       widevine_cdm.path = path;
       widevine_cdm.name = kWidevineCdmDisplayName;
-      widevine_cdm.description = kWidevineCdmDescription;
+      widevine_cdm.description = kWidevineCdmDescription +
+                                 std::string(" (version: ") +
+                                 WIDEVINE_CDM_VERSION_STRING + ")";
       widevine_cdm.version = WIDEVINE_CDM_VERSION_STRING;
       content::WebPluginMimeType widevine_cdm_mime_type(
           kWidevineCdmPluginMimeType,