Unifies LayerTreeHost::SetNeedsUpdateLayers and SetNeedsAnimate -- V2

[2/2] Unifies LayerTreeHost::SetNeedsUpdateLayers and SetNeedsAnimate

They basically do the same thing except that SetNeedsAnimate makes the next
commit non-cancellable. However there is really no reason why SetNeedsAnimate
need to enforce a commit even if no tiles are updated and no layer properties
changed.

SetNeedsAnimate is thus merged into SetNeedsUpdateLayers. The proper use of
it is when there are potential layout/tile changes, we can use it to defer
calculation until the next frame. A commit will be scheduled but can be
cancelled if no updates are needed after calculation.

This part of the patch changes code behavior slightly.
SingleThreadProxy::SetNeedsUpdateLayers was originally implemented as
RenderWidget::ScheduleComposite but now it is RenderWidget::ScheduleAnimation.
ThreadProxy::SetNeedsAnimate was non-cancellable but is now cancellable.

[1/2] Cleanup RenderWidget::scheduleComposite/scheduleAnimation

scheduleComposite has been renamed to ScheduleComposite as it is no longer
a part of WebWidgetClient API.

scheduleAnimation has been renamed to ScheduleAnimation. The semantics is to
schedule a composite and also (potentially) animating WebWidget.

A new WebWidgetClient API scheduleUpdate has been added, to replace the old
scheduleAnimation. The semantics is to notify the embedder that something in
the WebWidget may change in 0 seconds. (i.e. it is allowed to be called
during a redraw, in such case another redraw will be scheduled after frame
delay.

This part of the patch should not change code behavior.

BUG=316929
R=danakj,jamesr,jochen

Review URL: https://codereview.chromium.org/133263004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245445 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 1 deletions

diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index 36621d0..b5e09f9 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -514,6 +514,10 @@ void LayerTreeTest::ScheduleComposite() {
       base::Bind(&LayerTreeTest::DispatchComposite, main_thread_weak_ptr_));
 }
 
+void LayerTreeTest::ScheduleAnimation() {
+  ScheduleComposite();
+}
+
 void LayerTreeTest::RealEndTest() {
   if (layer_tree_host_ && proxy()->CommitPendingForTesting()) {
     main_task_runner_->PostTask(
@@ -597,7 +601,7 @@ void LayerTreeTest::DispatchSetNextCommitForcesRedraw() {
   DCHECK(!proxy() || proxy()->IsMainThread());
 
   if (layer_tree_host_)
-    layer_tree_host_->SetNextCommitForcesRedraw();
+    layer_tree_host_->set_next_commit_forces_redraw();
 }
 
 void LayerTreeTest::DispatchComposite() {