Keep browser process alive while there are platform apps with background pages running.

chrome/browser/extensions/extension_host.cc

Index: chrome/browser/extensions/extension_host.cc
diff --git a/chrome/browser/extensions/extension_host.cc b/chrome/browser/extensions/extension_host.cc
index c1bd02b08a191a1aac8fc33b2b20c2d909d2ed61..bd37ca140183b80b887240054d34b941615b7d4a 100644
--- a/chrome/browser/extensions/extension_host.cc
+++ b/chrome/browser/extensions/extension_host.cc
@@ -21,6 +21,7 @@
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/extensions/window_controller.h"
 #include "chrome/browser/file_select_helper.h"
+#include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h"
 #include "chrome/browser/ui/browser.h"
@@ -141,6 +142,7 @@ ExtensionHost::ExtensionHost(const Extension* extension,
       render_view_host_(NULL),
       did_stop_loading_(false),
       document_element_available_(false),
+      keeping_browser_process_alive_(false),
       initial_url_(url),
       ALLOW_THIS_IN_INITIALIZER_LIST(
           extension_function_dispatcher_(profile_, this)),
@@ -173,6 +175,9 @@ ExtensionHost::~ExtensionHost() {
       content::Source<Profile>(profile_),
       content::Details<ExtensionHost>(this));
   ProcessCreationQueue::GetInstance()->Remove(this);
+
+  if (keeping_browser_process_alive_)
+    browser::EndKeepAlive();
 }
 
 void ExtensionHost::CreateView(Browser* browser) {
@@ -469,6 +474,14 @@ void ExtensionHost::DidCloseJavaScriptDialog() {
     pm->DecrementLazyKeepaliveCount(extension());
 }
 
+void ExtensionHost::KeepBrowserProcessAlive() {

[Aaron Boodman, 2012/10/31 07:31:22]

Nit: I think SetKeepsBrowserProcessAlive() would be a bit more understandable.

[benwells, 2012/10/31 08:08:22]

Done.

+  if (keeping_browser_process_alive_)
+    return;
+
+  keeping_browser_process_alive_ = true;
+  browser::StartKeepAlive();
+}
+
 WebContents* ExtensionHost::OpenURLFromTab(WebContents* source,
                                            const OpenURLParams& params) {
   // Whitelist the dispositions we will allow to be opened.