Add feature for main frame before activation.

content/browser/gpu/compositor_util.h

Index: content/browser/gpu/compositor_util.h
diff --git a/content/browser/gpu/compositor_util.h b/content/browser/gpu/compositor_util.h
index 5a6cf07c9b74486efd452ff5c208d85f9fd58a84..61d597ac6d507f0cb3c6eeae3a482fc5a34a6d6e 100644
--- a/content/browser/gpu/compositor_util.h
+++ b/content/browser/gpu/compositor_util.h
@@ -39,6 +39,9 @@ CONTENT_EXPORT bool IsForceGpuRasterizationEnabled();
 // Returns the number of raster threads to use for compositing.
 CONTENT_EXPORT int NumberOfRendererRasterThreads();
 
+// Returns true if main thread can be pipelined with activation.
+CONTENT_EXPORT bool IsMainFrameBeforeActivationEnabled();
+
 CONTENT_EXPORT base::DictionaryValue* GetFeatureStatus();
 CONTENT_EXPORT base::Value* GetProblems();
 CONTENT_EXPORT std::vector<std::string> GetDriverBugWorkarounds();