Add a ResourceScheduler to ResourceDispatcherHost.

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/bind.h"
@@ skipping 5591 matching lines @@
   // of loading and we don't want to save stats.
   if (!main_frame->provisionalDataSource()) {
     WebDataSource* ds = main_frame->dataSource();
     DocumentState* document_state = DocumentState::FromDataSource(ds);
 
     // TODO(jar): The following code should all be inside a method, probably in
     // NavigatorState.
     Time now = Time::Now();
     if (document_state->first_paint_time().is_null()) {
       document_state->set_first_paint_time(now);
+      Send(new ViewHostMsg_DidFirstPaint(routing_id()));

[darin (slow to review), 2012/12/14 22:16:28]

did you consider just watching for the first ViewHostMsg_UpdateRect message
after ViewHostMsg_FrameNavigate?  seems a bit unfortunate to add more IPCs when
there is already a way to observe what you want to observe.

[James Simonsen, 2012/12/15 02:58:57]

Yeah, I did. You talked me out of it. :)

Let's see if your argument works again. Basically, you said the one point in
RenderViewImpl where we record the first paint histogram is the authority on
first paint. We know it to be correct regardless of whether we're using GPU or
software. So, it's best to key off of that.

     }
     if (document_state->first_paint_after_load_time().is_null() &&
         !document_state->finish_load_time().is_null()) {
       document_state->set_first_paint_after_load_time(now);
     }
   }
 }
 
 void RenderViewImpl::OnViewContextSwapBuffersPosted() {
   RenderWidget::OnSwapBuffersPosted();
@@ skipping 863 matching lines @@
 }
 #endif
 
 void RenderViewImpl::OnReleaseDisambiguationPopupDIB(
     TransportDIB::Handle dib_handle) {
   TransportDIB* dib = TransportDIB::CreateWithHandle(dib_handle);
   RenderProcess::current()->ReleaseTransportDIB(dib);
 }
 
 }  // namespace content