Add TraceEvent for frame updates in browser

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 6ad58aab468313dc1060d3bc70c34f912b28437f..9b8cde61ef94cdbf6f262c24e2cc6553a9fc680b 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -1974,7 +1974,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
             float viewportWidth, float viewportHeight,
             float controlsOffsetYCss, float contentOffsetYCss,
             float overdrawBottomHeightCss) {
-
+        TraceEvent.instant("ContentViewCore:updateFrameInfo");
         // Adjust contentWidth/Height to be always at least as big as
         // the actual viewport (as set by onSizeChanged).
         contentWidth = Math.max(contentWidth,