cc: Always use SetNeedsBeginFrame to request the next BeginFrame

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index ebdc289b18e50082e00ff9cac20698d227e00f0b..ea1f859699ee1ad99fd2db1670b7f231186ab319 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -191,14 +191,10 @@ void Scheduler::DrawAndSwapIfPossible() {
   DrawSwapReadbackResult result =
       client_->ScheduledActionDrawAndSwapIfPossible();
   state_machine_.DidDrawIfPossibleCompleted(result.did_draw);
-  if (result.did_swap)
-    has_pending_begin_frame_ = false;
 }
 
 void Scheduler::DrawAndSwapForced() {
-  DrawSwapReadbackResult result = client_->ScheduledActionDrawAndSwapForced();
-  if (result.did_swap)
-    has_pending_begin_frame_ = false;
+  client_->ScheduledActionDrawAndSwapForced();
 }
 
 void Scheduler::DrawAndReadback() {