Enable UpdateProcessPriority() on startup on Chrome OS.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index f37f453192b0288959dd83880c2c4c6d2cfb4bda..2ed18f76836d18c0492ff2328622ea2652675a4b 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -2612,7 +2612,8 @@ void RenderProcessHostImpl::OnProcessLaunched() {
     // is made. A better long term solution would be to be aware of the tab's
     // visibility at this point. https://crbug.com/560446.
     // Except on Android for now because of https://crbug.com/601184 :-(.
-#if defined(OS_ANDROID)
+    // The exception also applies to Chrome OS: https://crbug.com/601023.
+#if defined(OS_ANDROID) || defined(OS_CHROMEOS)

[rjkroege, 2016/04/18 17:06:07]

I am not convinced that this is the right place for this functionality
especially as we mojo-i-fy CrOS chrome.

     UpdateProcessPriority();
 #endif