Plugins: Add UKM Metrics to Flash loads

chrome/browser/plugins/plugin_info_message_filter.h

Index: chrome/browser/plugins/plugin_info_message_filter.h
diff --git a/chrome/browser/plugins/plugin_info_message_filter.h b/chrome/browser/plugins/plugin_info_message_filter.h
index 67a851f5db54bd3c7af6d0dba6a2df4b4e7aa34e..7cffe9a3fbb69514b33f0e79d6789c07df30d215 100644
--- a/chrome/browser/plugins/plugin_info_message_filter.h
+++ b/chrome/browser/plugins/plugin_info_message_filter.h
@@ -14,6 +14,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
+#include "base/strings/string_piece.h"
 #include "chrome/browser/plugins/plugin_metadata.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "components/content_settings/core/common/content_settings.h"
@@ -62,6 +63,8 @@ class PluginInfoMessageFilter : public content::BrowserMessageFilter {
 
     ~Context();
 
+    int render_process_id() { return render_process_id_; }
+
     void DecidePluginStatus(
         const GURL& url,
         const url::Origin& main_frame_origin,
@@ -150,11 +153,22 @@ class PluginInfoMessageFilter : public content::BrowserMessageFilter {
       std::vector<base::string16>* additional_param_values);
 #endif
 
+  // Reports usage metrics to RAPPOR and UKM. This must be a class function,
+  // because UkmService requires a friend declaration by design to call.
+  void ReportMetrics(int render_frame_id,
+                     const base::StringPiece& mime_type,
+                     const GURL& url,
+                     const url::Origin& main_frame_origin,
+                     int32_t ukm_source_id);
+
   Context context_;
   std::unique_ptr<KeyedServiceShutdownNotifier::Subscription>
       shutdown_notifier_;
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+
+  const int32_t ukm_source_id_;
+
   base::WeakPtrFactory<PluginInfoMessageFilter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginInfoMessageFilter);