Update from https://crrev.com/304418

cc/trees/thread_proxy.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/thread_proxy.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 461 matching lines @@
   DCHECK(IsImplThread());
   impl().scheduler->SetNeedsManageTiles();
 }
 
 void ThreadProxy::SetNeedsRedrawRectOnImplThread(const gfx::Rect& damage_rect) {
   DCHECK(IsImplThread());
   impl().layer_tree_host_impl->SetViewportDamage(damage_rect);
   SetNeedsRedrawOnImplThread();
 }
 
-void ThreadProxy::SetSwapUsedIncompleteTileOnImplThread(
-    bool used_incomplete_tile) {
-  DCHECK(IsImplThread());
-  if (used_incomplete_tile) {
-    TRACE_EVENT_INSTANT0("cc",
-                         "ThreadProxy::SetSwapUsedIncompleteTileOnImplThread",
-                         TRACE_EVENT_SCOPE_THREAD);
-  }
-  impl().scheduler->SetSwapUsedIncompleteTile(used_incomplete_tile);
-}
-
-void ThreadProxy::DidInitializeVisibleTileOnImplThread() {
-  TRACE_EVENT0("cc", "ThreadProxy::DidInitializeVisibleTileOnImplThread");
-  DCHECK(IsImplThread());
-  impl().scheduler->SetNeedsRedraw();
-}
-
 void ThreadProxy::MainThreadHasStoppedFlinging() {
   DCHECK(IsMainThread());
   Proxy::ImplThreadTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&ThreadProxy::MainThreadHasStoppedFlingingOnImplThread,
                  impl_thread_weak_ptr_));
 }
 
 void ThreadProxy::MainThreadHasStoppedFlingingOnImplThread() {
   DCHECK(IsImplThread());
@@ skipping 473 matching lines @@
   // often a good bit of work to update the tree and prepare the new frame.
   impl().layer_tree_host_impl->CommitComplete();
 
   SetInputThrottledUntilCommitOnImplThread(false);
 
   impl().next_frame_is_newly_committed_frame = true;
 
   impl().timing_history.DidCommit();
 }
 
-void ThreadProxy::ScheduledActionUpdateVisibleTiles() {
-  TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionUpdateVisibleTiles");
-  DCHECK(IsImplThread());
-  impl().layer_tree_host_impl->UpdateVisibleTiles();
-}
-
 void ThreadProxy::ScheduledActionActivateSyncTree() {
   TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionActivateSyncTree");
   DCHECK(IsImplThread());
   impl().layer_tree_host_impl->ActivateSyncTree();
 }
 
 void ThreadProxy::ScheduledActionBeginOutputSurfaceCreation() {
   TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionBeginOutputSurfaceCreation");
   DCHECK(IsImplThread());
   Proxy::MainThreadTaskRunner()->PostTask(
@@ skipping 40 matching lines @@
         &frame, impl().scheduler->LastBeginImplFrameTime());
     result = DRAW_SUCCESS;
   } else {
     DCHECK_NE(DRAW_SUCCESS, result);
   }
   impl().layer_tree_host_impl->DidDrawAllLayers(frame);
 
   bool start_ready_animations = draw_frame;
   impl().layer_tree_host_impl->UpdateAnimationState(start_ready_animations);
 
-  if (draw_frame) {
-    bool did_request_swap = impl().layer_tree_host_impl->SwapBuffers(frame);
-
-    // We don't know if we have incomplete tiles if we didn't actually swap.
-    if (did_request_swap) {
-      DCHECK(!frame.has_no_damage);
-      SetSwapUsedIncompleteTileOnImplThread(frame.contains_incomplete_tile);
-    }
-  }
+  if (draw_frame)
+    impl().layer_tree_host_impl->SwapBuffers(frame);
 
   // Tell the main thread that the the newly-commited frame was drawn.
   if (impl().next_frame_is_newly_committed_frame) {
     impl().next_frame_is_newly_committed_frame = false;
     Proxy::MainThreadTaskRunner()->PostTask(
         FROM_HERE,
         base::Bind(&ThreadProxy::DidCommitAndDrawFrame, main_thread_weak_ptr_));
   }
 
   if (result == DRAW_SUCCESS)
@@ skipping 286 matching lines @@
 
   impl().timing_history.DidActivateSyncTree();
 }
 
 void ThreadProxy::DidManageTiles() {
   DCHECK(IsImplThread());
   impl().scheduler->DidManageTiles();
 }
 
 }  // namespace cc