[Custom Tabs] Postpone RecordAction until native libray is loaded

chrome/android/java/src/org/chromium/chrome/browser/metrics/LaunchMetrics.java

Index: chrome/android/java/src/org/chromium/chrome/browser/metrics/LaunchMetrics.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/metrics/LaunchMetrics.java b/chrome/android/java/src/org/chromium/chrome/browser/metrics/LaunchMetrics.java
index 87e457bebf7903feaae2711693e3810b91e5d987..dd817abbb4d722210a29a2dbfe3e8e3782906987 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/metrics/LaunchMetrics.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/metrics/LaunchMetrics.java
@@ -8,6 +8,7 @@ import android.util.Pair;
 
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.metrics.RecordHistogram;
+import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.content_public.browser.WebContents;
 
 import java.util.ArrayList;
@@ -43,6 +44,21 @@ public class LaunchMetrics {
         protected abstract void commitAndClear();
     }
 
+    /**
+     * Caches an action that will be recorded after native side is loaded.
+     */
+    public static class ActionEvent extends CachedHistogram {
+

[gone, 2016/04/27 00:30:09]

private boolean mNeedsToBeRecorded = true;


protected void commitAndClear() {
    if (mNeedsToBeRecorded) RecordUserAction.record(mHistogramName);
    mNeedsToBeRecorded = false;
}

[Ian Wen, 2016/04/27 00:39:44]

Done.

+        public ActionEvent(String actionName) {
+            super(actionName);
+        }
+
+        @Override
+        protected void commitAndClear() {
+            RecordUserAction.record(mHistogramName);
+        }
+    }
+
     /** Caches whether an event happened. */
     public static class BooleanEvent extends CachedHistogram {
         private boolean mIsHit;