Adds translate infobar impression in the old Translate UI on Android

chrome/android/java/src/org/chromium/chrome/browser/infobar/TranslateInfoBar.java

Index: chrome/android/java/src/org/chromium/chrome/browser/infobar/TranslateInfoBar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/infobar/TranslateInfoBar.java b/chrome/android/java/src/org/chromium/chrome/browser/infobar/TranslateInfoBar.java
index 5e01bbf14e6d1e18130e03583c21e7f144714425..9c0f5e618d2cb27c95b7963fa146a0d86238aae2 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/infobar/TranslateInfoBar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/infobar/TranslateInfoBar.java
@@ -14,6 +14,7 @@ import android.text.style.ClickableSpan;
 import android.view.View;
 
 import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.chrome.R;
 import org.chromium.ui.base.DeviceFormFactor;
 
@@ -42,6 +43,8 @@ public class TranslateInfoBar extends InfoBar implements SubPanelListener {
     private TranslateSubPanel mSubPanel;
     private final boolean mShouldShowNeverBar;
 
+    private static final String INFOBAR_IMPRESSION_HISTOGRAM = "Translate.InfobarImpression";
+
     @CalledByNative
     private static InfoBar show(int translateBarType, String sourceLanguageCode,
             String targetLanguageCode, boolean alwaysTranslate, boolean showNeverInfobar,
@@ -173,6 +176,7 @@ public class TranslateInfoBar extends InfoBar implements SubPanelListener {
 
     @Override
     public void createContent(InfoBarLayout layout) {
+        RecordHistogram.recordBooleanHistogram(INFOBAR_IMPRESSION_HISTOGRAM, true);
         if (mOptionsPanelViewType == NO_PANEL) {
             mSubPanel = null;
         } else {