Turn on threaded compositing in OS X for continuous builds.

chrome/browser/gpu/chrome_gpu_util.cc

Index: chrome/browser/gpu/chrome_gpu_util.cc
diff --git a/chrome/browser/gpu/chrome_gpu_util.cc b/chrome/browser/gpu/chrome_gpu_util.cc
index 73cca3e84b74b98aa98c96edfbf8086a4c823f55..441cebc31daa4b962ccce0a8b1dfb3f9928ad751 100644
--- a/chrome/browser/gpu/chrome_gpu_util.cc
+++ b/chrome/browser/gpu/chrome_gpu_util.cc
@@ -112,16 +112,9 @@ void InitializeCompositingFieldTrial() {
   // http://crbug.com/133602 for mac
   // http://crbug.com/140866 for linux
 
-#if defined(OS_WIN)
-  // Enable threaded compositing on Windows.
+#if defined(OS_WIN) || defined(OS_MACOSX)
+  // Enable threaded compositing on Windows and Mac.
   threaded_compositing_probability = kDivisor;
-#elif defined(OS_MACOSX)
-  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
-  if (channel == chrome::VersionInfo::CHANNEL_CANARY ||
-      channel == chrome::VersionInfo::CHANNEL_DEV) {
-    // Enable force-compositing-mode on the Mac.
-    force_compositing_mode_probability = kDivisor;
-  }
 #endif
 
   int force_compositing_group = trial->AppendGroup(