Log First User Interaction in Page Load Metrics

components/page_load_metrics/browser/metrics_web_contents_observer.h

Index: components/page_load_metrics/browser/metrics_web_contents_observer.h
diff --git a/components/page_load_metrics/browser/metrics_web_contents_observer.h b/components/page_load_metrics/browser/metrics_web_contents_observer.h
index d58cfb003b594b0b803b1b3b7fa8befb7d2354ab..bcbff77c50e0b938daab920cae6c9822574e95a9 100644
--- a/components/page_load_metrics/browser/metrics_web_contents_observer.h
+++ b/components/page_load_metrics/browser/metrics_web_contents_observer.h
@@ -17,6 +17,7 @@
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "net/base/net_errors.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace content {
 class NavigationHandle;
@@ -88,7 +89,10 @@ enum InternalErrorLoadEvent {
   ERR_NAVIGATION_SIGNALS_MULIPLE_ABORTED_LOADS,
 
   // Add values before this final count.
-  ERR_LAST_ENTRY
+  ERR_LAST_ENTRY,
+
+  // Receives user interaction before navigation start
+  ERR_USER_INTERACTION_WITH_NO_RELEVANT_LOAD

[Bryan McQuade, 2016/05/18 15:21:50]

this needs to be before ERR_LAST_ENTRY

 };
 
 // This class serves as a functional interface to various chrome// features.
@@ -123,6 +127,8 @@ class PageLoadTracker {
   void WebContentsHidden();
   void WebContentsShown();
 
+  void UserInteraction(blink::WebInputEvent::Type type);
+
   // Returns true if the timing was successfully updated.
   bool UpdateTiming(const PageLoadTiming& timing,
                     const PageLoadMetadata& metadata);
@@ -198,6 +204,8 @@ class PageLoadTracker {
   base::TimeTicks foreground_time_;
   bool started_in_foreground_;
 
+  base::TimeTicks user_interaction_time_;
+
   PageLoadTiming timing_;
   PageLoadMetadata metadata_;
 
@@ -247,6 +255,7 @@ class MetricsWebContentsObserver
   void DidRedirectNavigation(
       content::NavigationHandle* navigation_handle) override;
   void NavigationStopped() override;
+  void DidGetUserInteraction(const blink::WebInputEvent::Type type) override;
   void WasShown() override;
   void WasHidden() override;
   void RenderProcessGone(base::TerminationStatus status) override;