[TooManyTabs] Add TabNavigationThrottle

chrome/browser/resource_coordinator/tab_manager_web_contents_data.h

Index: chrome/browser/resource_coordinator/tab_manager_web_contents_data.h
diff --git a/chrome/browser/resource_coordinator/tab_manager_web_contents_data.h b/chrome/browser/resource_coordinator/tab_manager_web_contents_data.h
index 26749d436abd6e3d17c5804a889b850af9a9e03c..6b765c1919eb238066de56a383ee6ffd677ae102 100644
--- a/chrome/browser/resource_coordinator/tab_manager_web_contents_data.h
+++ b/chrome/browser/resource_coordinator/tab_manager_web_contents_data.h
@@ -32,6 +32,9 @@ class TabManager::WebContentsData
 
   // WebContentsObserver implementation:
   void DidStartLoading() override;
+  void DidStopLoading() override;
+  void DidStartNavigation(
+      content::NavigationHandle* navigation_handle) override;
   void WebContentsDestroyed() override;
 
   // Returns true if the tab has been discarded to save memory.
@@ -112,6 +115,8 @@ class TabManager::WebContentsData
     int discard_count;
     // Is the tab playing audio?
     bool is_recently_audible;
+    // Has the tab finished loading?
+    bool has_finished_loading;

[chrisha, 2017/06/15 21:02:24]

Another CL is adding a loading state... can this work be stacked on top of that?
Otherwise we'll have multiple mechanisms for doing the same thing...

[Zhen Wang, 2017/06/19 23:00:12]

I agree. I intended to use the other CL's loading state. This was uploaded
before that one was ready. Now removed.

     // Last time the tab started or stopped playing audio (we record the
     // transition time).
     base::TimeTicks last_audio_change_time;