cc: Control defer_commits logic by Scheduler

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index 243e6033ea0ddc8959cad5bdb67b2d40135e8cf6..8da0d0075ac1dcff9075d5d125e7e3501fd04494 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -446,13 +446,16 @@ void ThreadProxy::SetDeferCommits(bool defer_commits) {
   else
     TRACE_EVENT_ASYNC_END0("cc", "ThreadProxy::SetDeferCommits", this);
 
-  if (!main().defer_commits && main().pending_deferred_commit) {
-    Proxy::MainThreadTaskRunner()->PostTask(
-        FROM_HERE,
-        base::Bind(&ThreadProxy::BeginMainFrame,
-                   main_thread_weak_ptr_,
-                   base::Passed(&main().pending_deferred_commit)));
-  }
+  Proxy::ImplThreadTaskRunner()->PostTask(
+      FROM_HERE,
+      base::Bind(&ThreadProxy::SetDeferCommitsOnImplThread,
+                 impl_thread_weak_ptr_,
+                 defer_commits));
+}
+
+void ThreadProxy::SetDeferCommitsOnImplThread(bool defer_commits) const {
+  DCHECK(IsImplThread());
+  impl().scheduler->SetDeferCommits(defer_commits);
 }
 
 bool ThreadProxy::CommitRequested() const {
@@ -695,10 +698,12 @@ void ThreadProxy::BeginMainFrame(
   DCHECK(IsMainThread());
 
   if (main().defer_commits) {
-    main().pending_deferred_commit = begin_main_frame_state.Pass();
-    layer_tree_host()->DidDeferCommit();
-    TRACE_EVENT_INSTANT0(
-        "cc", "EarlyOut_DeferCommits", TRACE_EVENT_SCOPE_THREAD);
+    TRACE_EVENT_INSTANT0("cc", "EarlyOut_DeferCommit",
+                         TRACE_EVENT_SCOPE_THREAD);
+    Proxy::ImplThreadTaskRunner()->PostTask(
+        FROM_HERE, base::Bind(&ThreadProxy::BeginMainFrameAbortedOnImplThread,
+                              impl_thread_weak_ptr_,
+                              CommitEarlyOutReason::ABORTED_DEFERRED_COMMIT));
     return;
   }