Add calls to inform gpu of browser window count

chrome/browser/chrome_gpu_util.h

Index: chrome/browser/chrome_gpu_util.h
diff --git a/chrome/browser/chrome_gpu_util.h b/chrome/browser/chrome_gpu_util.h
index a4f9efc800c335a33f526bf95fd7e88b3f69e2ce..e7da93065fed62e41f152197a142df6030a06666 100644
--- a/chrome/browser/chrome_gpu_util.h
+++ b/chrome/browser/chrome_gpu_util.h
@@ -7,6 +7,14 @@
 
 namespace gpu_util {
 
+// Sets up a monitor for browser windows, to be used to determine gpu
+// managed memory allocation.
+// Not supported on Android.
+#if !defined(OS_ANDROID)
+void InstallBrowserMonitor();
+void UninstallBrowserMonitor();
+#endif // !defined(OS_ANDROID)
+
 // Sets up Stage3D on XP field trial
 void InitializeStage3DFieldTrial();