cc: Make the scheduler compositeAndReadback flow not race with WAITING_FOR_FIRST_DRAW

cc/scheduler_state_machine.h

Index: cc/scheduler_state_machine.h
diff --git a/cc/scheduler_state_machine.h b/cc/scheduler_state_machine.h
index 51b8dddc7b658106aa8a4c2014766f47d4c4a087..1c3905899b4d8755895d5817bbf52dd436d342bc 100644
--- a/cc/scheduler_state_machine.h
+++ b/cc/scheduler_state_machine.h
@@ -31,7 +31,8 @@ public:
         COMMIT_STATE_FRAME_IN_PROGRESS,
         COMMIT_STATE_READY_TO_COMMIT,
         COMMIT_STATE_WAITING_FOR_FIRST_DRAW,
-    };
+        COMMIT_STATE_WAITING_FOR_FIRST_FORCED_DRAW,
+   };
 
     enum TextureState {
         LAYER_TEXTURE_STATE_UNLOCKED,
@@ -47,7 +48,8 @@ public:
 
     bool commitPending() const
     {
-        return m_commitState != COMMIT_STATE_IDLE;
+        return m_commitState == COMMIT_STATE_FRAME_IN_PROGRESS ||
+            m_commitState == COMMIT_STATE_READY_TO_COMMIT;
     }
 
     bool redrawPending() const { return m_needsRedraw; }