Add metrics for triggering of JS dialogs on Android.

chrome/browser/android/tab_android.cc

Index: chrome/browser/android/tab_android.cc
diff --git a/chrome/browser/android/tab_android.cc b/chrome/browser/android/tab_android.cc
index 4ec05013a0dad2c83b0a887fdcc6b68261d492fb..dccb03aca342a5dab59094bc4394a976437767c9 100644
--- a/chrome/browser/android/tab_android.cc
+++ b/chrome/browser/android/tab_android.cc
@@ -172,6 +172,11 @@ GURL TabAndroid::GetURL() const {
       Java_Tab_getUrl(env, weak_java_tab_.get(env))));
 }
 
+bool TabAndroid::IsUserInteractable() const {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  return Java_Tab_isUserInteractable(env, weak_java_tab_.get(env));
+}
+
 bool TabAndroid::LoadIfNeeded() {
   JNIEnv* env = base::android::AttachCurrentThread();
   return Java_Tab_loadIfNeeded(env, weak_java_tab_.get(env));