Make resource throttles and AsyncResourceHandler add events to NetLog

when they block a request.  This is aimed at making issues easier to
debug when a delegate defers an request for significant periods of time.

Also display that information in about:net-internals when a request is
already active and blocked on a delegate.

BUG=94920

Review URL: https://codereview.chromium.org/25108004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238746 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 7 insertions, 0 deletions

diff --git a/content/browser/loader/async_resource_handler.cc b/content/browser/loader/async_resource_handler.cc
index 5983052..93d7e83 100644
--- a/content/browser/loader/async_resource_handler.cc
+++ b/content/browser/loader/async_resource_handler.cc
@@ -151,6 +151,7 @@ bool AsyncResourceHandler::OnRequestRedirected(int request_id,
     return false;
 
   *defer = did_defer_ = true;
+  OnDefer();
 
   if (rdh_->delegate()) {
     rdh_->delegate()->OnRequestRedirected(
@@ -287,6 +288,7 @@ bool AsyncResourceHandler::OnReadCompleted(int request_id, int bytes_read,
         "Net.AsyncResourceHandler_PendingDataCount_WhenFull",
         pending_data_count_, 0, 100, 100);
     *defer = did_defer_ = true;
+    OnDefer();
   }
 
   return true;
@@ -377,8 +379,13 @@ bool AsyncResourceHandler::EnsureResourceBufferIsInitialized() {
 void AsyncResourceHandler::ResumeIfDeferred() {
   if (did_defer_) {
     did_defer_ = false;
+    request()->LogUnblocked();
     controller()->Resume();
   }
 }
 
+void AsyncResourceHandler::OnDefer() {
+  request()->LogBlockedBy("AsyncResourceHandler");
+}
+
 }  // namespace content