Add a ResourceScheduler to ResourceDispatcherHost.

For this CL, ResourceScheduler mimicks WebKit's ResourceLoadScheduler. That means only JS and CSS are loaded before first paint.

Eventually, we will improve it to do things like:
- Lower priority of background tabs.
- Preconnect for low priority resources.
- Dynamically adapt scheduling to the user's connection.
- Experiment with other scheduling ideas.

BUG=157763


Review URL: https://chromiumcodereview.appspot.com/11270027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@183382 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 8 insertions, 0 deletions

diff --git a/content/browser/loader/resource_dispatcher_host_impl.h b/content/browser/loader/resource_dispatcher_host_impl.h
index edffcf7..0627227 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -27,6 +27,7 @@
 #include "content/browser/download/download_resource_handler.h"
 #include "content/browser/loader/resource_loader.h"
 #include "content/browser/loader/resource_loader_delegate.h"
+#include "content/browser/loader/resource_scheduler.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/download_id.h"
@@ -217,6 +218,8 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
 
   void ClearSSLClientAuthHandlerForRequest(net::URLRequest* request);
 
+  ResourceScheduler* scheduler() { return scheduler_.get(); }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            TestBlockedRequestsProcessDies);
@@ -256,6 +259,9 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
                                    int* render_process_host_id,
                                    int* render_view_host_id);
 
+  // An init helper that runs on the IO thread.
+  void OnInit();
+
   // A shutdown helper that runs on the IO thread.
   void OnShutdown();
 
@@ -429,6 +435,8 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
                    ObserverList<ResourceMessageDelegate>*> DelegateMap;
   DelegateMap delegate_map_;
 
+  scoped_ptr<ResourceScheduler> scheduler_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };