Add a ResourceScheduler to ResourceDispatcherHost.

content/browser/loader/resource_scheduler_filter.cc

Index: content/browser/loader/resource_scheduler_filter.cc
diff --git a/content/browser/loader/resource_scheduler_filter.cc b/content/browser/loader/resource_scheduler_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cbd388da2a428a0d2a6771876234e50081e23e75
--- /dev/null
+++ b/content/browser/loader/resource_scheduler_filter.cc
@@ -0,0 +1,53 @@
+// 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/browser/loader/resource_scheduler_filter.h"
+
+#include "content/browser/loader/resource_dispatcher_host_impl.h"
+#include "content/browser/loader/resource_scheduler.h"
+#include "content/common/view_messages.h"
+#include "content/public/common/page_transition_types.h"
+
+namespace content {
+
+ResourceSchedulerFilter::ResourceSchedulerFilter(int child_id)
+    : child_id_(child_id),
+      resource_scheduler_(ResourceDispatcherHostImpl::Get()->scheduler()) {
+}
+
+ResourceSchedulerFilter::~ResourceSchedulerFilter() {
+}
+
+bool ResourceSchedulerFilter::OnMessageReceived(const IPC::Message& message,
+                                                bool* message_was_ok) {
+  switch (message.type()) {
+    case ViewHostMsg_RenderViewReady::ID:
+      resource_scheduler_->OnCreate(child_id_, message.routing_id());
+      break;
+
+    case ViewHostMsg_FrameNavigate::ID: {
+      PickleIterator iter(message);
+      ViewHostMsg_FrameNavigate_Params params;
+      if (!IPC::ParamTraits<ViewHostMsg_FrameNavigate_Params>::Read(
+          &message, &iter, &params)) {
+        break;
+      }
+      if (PageTransitionIsMainFrame(params.transition)) {
+        resource_scheduler_->OnNavigate(child_id_, message.routing_id());

[darin (slow to review), 2012/12/18 21:09:56]

Perhaps OnNavigate and OnFirstPaint should return bool values to indicate if
they were not preceded by OnCreate?  Then, if we observe that, we might consider
killing the renderer?

+      }
+      break;
+    }
+
+    case ViewHostMsg_DidFirstPaint::ID:
+      resource_scheduler_->OnFirstPaint(child_id_, message.routing_id());
+      break;
+
+    default:
+      break;
+  }
+
+  return false;
+}
+
+}  // namespace content