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

webkit/glue/webkit_glue.h

 // Copyright (c) 2010 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.
 
 #ifndef WEBKIT_GLUE_WEBKIT_GLUE_H_
 #define WEBKIT_GLUE_WEBKIT_GLUE_H_
 
 #include "base/basictypes.h"
 
 #if defined(OS_WIN)
@@ skipping 28 matching lines @@
 }
 
 namespace webkit {
 namespace npapi {
 struct WebPluginInfo;
 }
 }
 
 namespace webkit_glue {
 
+// Chromium sets the minimum interval timeout to 4ms, overriding the
+// default of 10ms.  We'd like to go lower, however there are poorly
+// coded websites out there which do create CPU-spinning loops.  Using
+// 4ms prevents the CPU from spinning too busily and provides a balance
+// between CPU spinning and the smallest possible interval timer.
+const double kForegroundTabTimerInterval = 0.004;

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

i'm tempted to pull these constants out of webkit_glue.h as webkit_glue.h is a
messy dumping ground.  adding more stuff to it seems unsavory to me.

how about src/webkit/glue/webkit_constants.h?

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

Sure, good idea. Done.

+
+// Provides control over the minimum timer interval for background tabs.
+const double kBackgroundTabTimerInterval = 0.004;
 
 //---- BEGIN FUNCTIONS IMPLEMENTED BY WEBKIT/GLUE -----------------------------
 
 void SetJavaScriptFlags(const std::string& flags);
 
 // Turn on logging for flags in the provided comma delimited list.
 void EnableWebCoreLogChannels(const std::string& channels);
 
 // Returns the text of the document element.
 string16 DumpDocumentText(WebKit::WebFrame* web_frame);
@@ skipping 247 matching lines @@
 bool GetFontTable(int fd, uint32_t table, uint8_t* output,
                   size_t* output_length);
 #endif
 
 // ---- END FUNCTIONS IMPLEMENTED BY EMBEDDER ---------------------------------
 
 
 } // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_WEBKIT_GLUE_H_