Set the minimum timer interval on a per-page basis, and adjust it when...

webkit/glue/webpreferences.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/glue/webpreferences.h"
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebRuntimeFeatures.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebKit.h"
@@ skipping 52 matching lines @@
       webaudio_enabled(false),
       experimental_webgl_enabled(false),
       gl_multisampling_enabled(true),
       show_composited_layer_borders(false),
       accelerated_compositing_enabled(false),
       accelerated_layers_enabled(false),
       accelerated_video_enabled(false),
       accelerated_2d_canvas_enabled(false),
       accelerated_plugins_enabled(false),
       memory_info_enabled(false),
-      interactive_form_validation_enabled(true) {
+      interactive_form_validation_enabled(true),
+      minimum_timer_interval(webkit_glue::kForegroundTabTimerInterval) {
 }
 
 WebPreferences::~WebPreferences() {
 }
 
 void WebPreferences::Apply(WebView* web_view) const {
   WebSettings* settings = web_view->settings();
   settings->setStandardFontFamily(standard_font_family);
   settings->setFixedFontFamily(fixed_font_family);
   settings->setSerifFontFamily(serif_font_family);
@@ skipping 106 matching lines @@
        it != inspector_settings.end(); ++it)
     web_view->setInspectorSetting(WebString::fromUTF8(it->first),
                                   WebString::fromUTF8(it->second));
 
   // Tabs to link is not part of the settings. WebCore calls
   // ChromeClient::tabsToLinks which is part of the glue code.
   web_view->setTabsToLinks(tabs_to_links);
 
   settings->setInteractiveFormValidationEnabled(
       interactive_form_validation_enabled);
+
+  settings->setMinimumTimerInterval(minimum_timer_interval);

[darin (slow to review), 2011/02/17 06:42:32]

here, you can just pass webkit_glue::kForegroundTabTimerInterval

actually, a RenderView starts its life hidden.  maybe you should pass
kBackgroundTabTimerInterval here instead?

[Ken Russell (switch to Gerrit), 2011/02/18 01:05:54]

Using kBackgroundTabTimerInterval seems to work well. Done.

 }