Log First User Interaction in Page Load Metrics

components/page_load_metrics/browser/metrics_web_contents_observer.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_WEB_CONTENTS_OBSERVER_H_
 #define COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_WEB_CONTENTS_OBSERVER_H_
 
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "components/page_load_metrics/browser/page_load_metrics_observer.h"
 #include "components/page_load_metrics/common/page_load_timing.h"
+#include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/web_contents.h"
 #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;
 class RenderFrameHost;
 }  // namespace content
 
 namespace IPC {
 class Message;
 }  // namespace IPC
 
@@ skipping 50 matching lines @@
   // cc file for details). We use this error counter to understand how often it
   // happens.
   ERR_ABORT_BEFORE_NAVIGATION_START,
 
   // A new navigation triggers abort updates in multiple trackers in
   // |aborted_provisional_loads_|, when usually there should only be one (the
   // navigation that just aborted because of this one). If this happens, the
   // latest aborted load is used to track the chain size.
   ERR_NAVIGATION_SIGNALS_MULIPLE_ABORTED_LOADS,
 
+  // Receives user input before navigation start
+  ERR_USER_INPUT_WITH_NO_RELEVANT_LOAD,
+
   // Add values before this final count.
-  ERR_LAST_ENTRY
+  ERR_LAST_ENTRY,
 };
 
 // This class serves as a functional interface to various chrome// features.
 // Impl version is defined in chrome/browser/page_load_metrics.
 class PageLoadMetricsEmbedderInterface {
  public:
   virtual ~PageLoadMetricsEmbedderInterface() {}
   virtual bool IsPrerendering(content::WebContents* web_contents) = 0;
   virtual void RegisterObservers(PageLoadTracker* metrics) = 0;
 };
@@ skipping 14 matching lines @@
                   content::NavigationHandle* navigation_handle,
                   int aborted_chain_size,
                   int aborted_chain_size_same_url);
   ~PageLoadTracker();
   void Redirect(content::NavigationHandle* navigation_handle);
   void Commit(content::NavigationHandle* navigation_handle);
   void FailedProvisionalLoad(content::NavigationHandle* navigation_handle);
   void WebContentsHidden();
   void WebContentsShown();
 
+  void OnInputEvent(const blink::WebInputEvent& event);
+
   // Returns true if the timing was successfully updated.
   bool UpdateTiming(const PageLoadTiming& timing,
                     const PageLoadMetadata& metadata);
 
   void set_renderer_tracked(bool renderer_tracked);
   bool renderer_tracked() const { return renderer_tracked_; }
 
   int aborted_chain_size() const { return aborted_chain_size_; }
   int aborted_chain_size_same_url() const {
     return aborted_chain_size_same_url_;
@@ skipping 83 matching lines @@
   std::vector<std::unique_ptr<PageLoadMetricsObserver>> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(PageLoadTracker);
 };
 
 // MetricsWebContentsObserver tracks page loads and loading metrics
 // related data based on IPC messages received from a
 // MetricsRenderFrameObserver.
 class MetricsWebContentsObserver
     : public content::WebContentsObserver,
-      public content::WebContentsUserData<MetricsWebContentsObserver> {
+      public content::WebContentsUserData<MetricsWebContentsObserver>,
+      public content::RenderWidgetHost::InputEventObserver {
  public:
   // Note that the returned metrics is owned by the web contents.
   static MetricsWebContentsObserver* CreateForWebContents(
       content::WebContents* web_contents,
       std::unique_ptr<PageLoadMetricsEmbedderInterface> embedder_interface);
   MetricsWebContentsObserver(
       content::WebContents* web_contents,
       std::unique_ptr<PageLoadMetricsEmbedderInterface> embedder_interface);
   ~MetricsWebContentsObserver() override;
 
   // content::WebContentsObserver implementation:
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* render_frame_host) override;
   void DidStartNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidFinishNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidRedirectNavigation(
       content::NavigationHandle* navigation_handle) override;
   void NavigationStopped() override;
+  void OnInputEvent(const blink::WebInputEvent& event) override;
   void WasShown() override;
   void WasHidden() override;
   void RenderProcessGone(base::TerminationStatus status) override;
+  void RenderViewHostChanged(content::RenderViewHost* old_host,
+                             content::RenderViewHost* new_host) override;
 
  private:
   friend class content::WebContentsUserData<MetricsWebContentsObserver>;
 
   // Notify all loads, provisional and committed, that we performed an action
   // that might abort them.
   void NotifyAbortAllLoads(UserAbortType abort_type);
   void NotifyAbortAllLoadsWithTimestamp(UserAbortType abort_type,
                                         base::TimeTicks timestamp);
+
+  // Register / Unregister input event callback to given RenderViewHost
+  void RegisterInputEventObserver(content::RenderViewHost* host);
+  void UnregisterInputEventObserver(content::RenderViewHost* host);
+
   // Notify aborted provisional loads that a new navigation occurred. This is
   // used for more consistent attribution tracking for aborted provisional
-  // loads. This method returns the provisional load that was likely aborted by
-  // this navigation, to help instantiate the new PageLoadTracker.
+  // loads. This method returns the provisional load that was likely aborted
+  // by this navigation, to help instantiate the new PageLoadTracker.
   std::unique_ptr<PageLoadTracker> NotifyAbortedProvisionalLoadsNewNavigation(
       content::NavigationHandle* new_navigation);
 
   void OnTimingUpdated(content::RenderFrameHost*,
                        const PageLoadTiming& timing,
                        const PageLoadMetadata& metadata);
 
   // True if the web contents is currently in the foreground.
   bool in_foreground_;
 
   // The PageLoadTrackers must be deleted before the |embedded_interface_|,
   // because they hold a pointer to the |embedder_interface_|.
   std::unique_ptr<PageLoadMetricsEmbedderInterface> embedder_interface_;
 
   // This map tracks all of the navigations ongoing that are not committed
   // yet. Once a navigation is committed, it moves from the map to
   // committed_load_. Note that a PageLoadTrackers NavigationHandle is only
   // valid until commit time, when we remove it from the map.
   std::map<content::NavigationHandle*, std::unique_ptr<PageLoadTracker>>
       provisional_loads_;
 
   // Tracks aborted provisional loads for a little bit longer than usual (one
   // more navigation commit at the max), in order to better understand how the
-  // navigation failed. This is because most provisional loads are destroyed and
-  // vanish before we get signal about what caused the abort (new navigation,
-  // stop button, etc.).
+  // navigation failed. This is because most provisional loads are destroyed
+  // and vanish before we get signal about what caused the abort (new
+  // navigation, stop button, etc.).
   std::vector<std::unique_ptr<PageLoadTracker>> aborted_provisional_loads_;
 
   std::unique_ptr<PageLoadTracker> committed_load_;
 
   // Has the MWCO observed at least one navigation?
   bool has_navigated_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsWebContentsObserver);
 };
 
 }  // namespace page_load_metrics
 
 #endif  // COMPONENTS_PAGE_LOAD_METRICS_BROWSER_METRICS_WEB_CONTENTS_OBSERVER_H_