Add TraceEvent for frame updates in browser

Add ContentViewCore#udpateFrameInfo trace event.

BUG=


Review URL: https://chromiumcodereview.appspot.com/13688003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192508 0039d316-1c4b-4281-b951-d872f2087c98

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,