Remove browser-side tracking of accelerated compositing

content/browser/compositor/delegated_frame_host.cc

Index: content/browser/compositor/delegated_frame_host.cc
diff --git a/content/browser/compositor/delegated_frame_host.cc b/content/browser/compositor/delegated_frame_host.cc
index eddedf486602379b40528cf586908b9a4f5ec354..083041c38fcc8837dd5049a12a7289de1858b268 100644
--- a/content/browser/compositor/delegated_frame_host.cc
+++ b/content/browser/compositor/delegated_frame_host.cc
@@ -46,11 +46,9 @@ DelegatedFrameHost::DelegatedFrameHost(DelegatedFrameHostClient* client)
 }
 
 void DelegatedFrameHost::WasShown() {
-  RenderWidgetHostImpl* host = client_->GetHost();
   delegated_frame_evictor_->SetVisible(true);
 
-  if (host->is_accelerated_compositing_active() &&
-      !released_front_lock_.get()) {
+  if (!released_front_lock_.get()) {
     ui::Compositor* compositor = client_->GetCompositor();
     if (compositor)
       released_front_lock_ = compositor->GetCompositorLock();
@@ -100,8 +98,6 @@ bool DelegatedFrameHost::ShouldCreateResizeLock() {
 
   if (host->should_auto_resize())
     return false;
-  if (!host->is_accelerated_compositing_active())

[danakj, 2014/05/12 17:37:58]

Does this mean if you tried to resize during a slow page load, you'd resize lock
until the new site loaded while we're showing blank? Or are there any
implications to this wrt page load that we need to consider?

[piman, 2014/05/13 20:25:40]

It is actually a desirable outcome. The resize lock is on a (short) timeout. If
the page finishes loading during that time, and is able to produce a frame of
the right size, we'd want to give it a chance.

-    return false;
 
   gfx::Size desired_size = client_->DesiredFrameSize();
   if (desired_size == current_frame_size_in_dip_)
@@ -209,10 +205,8 @@ bool DelegatedFrameHost::CanCopyToBitmap() const {
 }
 
 bool DelegatedFrameHost::CanCopyToVideoFrame() const {
-  RenderWidgetHostImpl* host = client_->GetHost();
   return client_->GetCompositor() &&
-         client_->GetLayer()->has_external_content() &&
-         host->is_accelerated_compositing_active();
+         client_->GetLayer()->has_external_content();
 }
 
 bool DelegatedFrameHost::CanSubscribeFrame() const {