Unify Android Webview and Chrome's fling

content/browser/android/in_process/synchronous_compositor_impl.cc

Index: content/browser/android/in_process/synchronous_compositor_impl.cc
diff --git a/content/browser/android/in_process/synchronous_compositor_impl.cc b/content/browser/android/in_process/synchronous_compositor_impl.cc
index d3c6b830b7082bf6e2dec32f803b6751d249aa47..2583de409741b908b24a8fc4fb8e18824ceabb42 100644
--- a/content/browser/android/in_process/synchronous_compositor_impl.cc
+++ b/content/browser/android/in_process/synchronous_compositor_impl.cc
@@ -328,10 +328,17 @@ gfx::ScrollOffset SynchronousCompositorImpl::GetTotalScrollOffset() {
       compositor_client_->GetTotalRootLayerScrollOffset());
 }
 
-bool SynchronousCompositorImpl::IsExternalFlingActive() const {
+bool SynchronousCompositorImpl::IsExternalScrollActive() const {
   DCHECK(CalledOnValidThread());
   DCHECK(compositor_client_);
-  return compositor_client_->IsExternalFlingActive();
+  return compositor_client_->IsExternalScrollActive();
+}
+
+void SynchronousCompositorImpl::SetNeedsAnimate(
+    const AnimationCallback& animation) {
+  DCHECK(CalledOnValidThread());
+  if (compositor_client_)

[boliu, 2015/05/29 19:42:47]

This is a call from cc, right? In that case, DCHECK(compositor_client_) should
be fine.

[hush (inactive), 2015/06/05 21:47:22]

Yes. This is a new function added to LayerScrollOffsetDelegate and it is only
called from LTHI. Done.

+    compositor_client_->SetNeedsAnimateScroll(animation);
 }
 
 void SynchronousCompositorImpl::UpdateRootLayerState(