Add trace to the caller of QuotaManager::GetAvailableSpace

chrome/browser/ui/webui/quota_internals/quota_internals_proxy.cc

Index: chrome/browser/ui/webui/quota_internals/quota_internals_proxy.cc
diff --git a/chrome/browser/ui/webui/quota_internals/quota_internals_proxy.cc b/chrome/browser/ui/webui/quota_internals/quota_internals_proxy.cc
index 1e0ab13a662f7a3c3310e4be0836770e49eea278..f52e2aeff7a97bbe77dec2e037fa9b7cc0e9ed79 100644
--- a/chrome/browser/ui/webui/quota_internals/quota_internals_proxy.cc
+++ b/chrome/browser/ui/webui/quota_internals/quota_internals_proxy.cc
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/bind.h"
+#include "base/trace_event/trace_event.h"
 #include "chrome/browser/ui/webui/quota_internals/quota_internals_handler.h"
 #include "chrome/browser/ui/webui/quota_internals/quota_internals_types.h"
 #include "net/base/net_util.h"
@@ -30,11 +31,14 @@ void QuotaInternalsProxy::RequestInfo(
         base::Bind(&QuotaInternalsProxy::RequestInfo, this, quota_manager));
     return;
   }
-
   quota_manager_ = quota_manager;
-  quota_manager_->GetAvailableSpace(
-      base::Bind(&QuotaInternalsProxy::DidGetAvailableSpace,
-                 weak_factory_.GetWeakPtr()));
+  {
+    // crbug.com/349708
+    TRACE_EVENT0("io", "QuotaInternalsProxy::RequestInfo");
+    quota_manager_->GetAvailableSpace(
+        base::Bind(&QuotaInternalsProxy::DidGetAvailableSpace,
+                   weak_factory_.GetWeakPtr()));
+  }
 
   quota_manager_->GetTemporaryGlobalQuota(
       base::Bind(&QuotaInternalsProxy::DidGetGlobalQuota,