Add a telemetry measurement for property tree performance.

content/browser/gpu/compositor_util.cc

Index: content/browser/gpu/compositor_util.cc
diff --git a/content/browser/gpu/compositor_util.cc b/content/browser/gpu/compositor_util.cc
index 9606eb56756506d28b3b9df1bf77fabe5f3cd933..d05609d2d3a84df02a45e1b29801a8082bcd2765 100644
--- a/content/browser/gpu/compositor_util.cc
+++ b/content/browser/gpu/compositor_util.cc
@@ -179,6 +179,12 @@ bool IsPinchVirtualViewportEnabled() {
   return true;
 }
 
+bool IsPropertyTreeVerificationEnabled() {
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
+  return command_line.HasSwitch(cc::switches::kEnablePropertyTreeVerification);
+}
+
 bool IsDelegatedRendererEnabled() {
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();