Cleanup blink-side PlzNavigate logic

third_party/WebKit/Source/core/loader/DocumentLoader.h

Index: third_party/WebKit/Source/core/loader/DocumentLoader.h
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.h b/third_party/WebKit/Source/core/loader/DocumentLoader.h
index ac5e7b73550fd341e906f5e24fdf942fbc32e069..e172bc3fae9447e684bfce22597ea0734850a98a 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.h
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.h
@@ -134,6 +134,12 @@ class CORE_EXPORT DocumentLoader
     return m_state >= Committed && !m_dataReceived;
   }
 
+  // Without PlzNavigate, this is only true for a narrow window during

[clamy, 2017/03/02 14:37:18]

Did you mean "Without PlzNavigate, this is only false..."?

[Nate Chapin, 2017/03/02 19:39:17]

Yep. Booleans are hard.

+  // navigation start. For PlzNavigate, a navigation sent to the browser will
+  // leave a dummy DocumentLoader in the NotStarted state until the navigation
+  // is actually handled in the renderer.
+  bool didStart() const { return m_state != NotStarted; }
+
   void setSentDidFinishLoad() { m_state = SentDidFinishLoad; }
   bool sentDidFinishLoad() const { return m_state == SentDidFinishLoad; }