Do not set low priority on background tabs.

BUG=381820

Review URL: https://codereview.chromium.org/420603014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285802 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/child_process_launcher.cc

@@ -510,11 +510,13 @@ base::TerminationStatus ChildProcessLauncher::GetChildTerminationStatus(
 }
 
 void ChildProcessLauncher::SetProcessBackgrounded(bool background) {
-  BrowserThread::PostTask(
-      BrowserThread::PROCESS_LAUNCHER, FROM_HERE,
-      base::Bind(
-          &ChildProcessLauncher::Context::SetProcessBackgrounded,
-          GetHandle(), background));
+  // TODO(wfh): re-enable this after testing if dropping the priority of
+  // backgrounded tabs is the root cause of http://crbug.com/381820.
+  // BrowserThread::PostTask(
+  //     BrowserThread::PROCESS_LAUNCHER, FROM_HERE,
+  //     base::Bind(
+  //         &ChildProcessLauncher::Context::SetProcessBackgrounded,
+  //         GetHandle(), background));
 }
 
 void ChildProcessLauncher::SetTerminateChildOnShutdown(

content/browser/renderer_host/render_process_host_impl.cc

@@ -2033,7 +2033,9 @@ void RenderProcessHostImpl::SetBackgrounded(bool backgrounded) {
 #endif  // OS_WIN
 
   // Notify the child process of background state.
-  Send(new ChildProcessMsg_SetProcessBackgrounded(backgrounded));
+  // TODO(wfh): re-enable this after testing if dropping the priority of
+  // backgrounded tabs is the root cause of http://crbug.com/381820.
+  // Send(new ChildProcessMsg_SetProcessBackgrounded(backgrounded));
 
 #if !defined(OS_WIN)
   // Backgrounding may require elevated privileges not available to renderer