[Chrome Home Survey] Prevents double clicking on an infobar

Prevents double tapping of a survey info bar to prevent
  any double click issues e.g. this crash

Bug: 791076
Change-Id: Ifcb8961beaf4bcd1353eb1a121f51e2249de3809
Reviewed-on: https://chromium-review.googlesource.com/804751Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Daniel Park <danielpark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521447}

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

@@ -91,13 +91,18 @@ public class SurveyInfoBar extends InfoBar {
         });
 
         NoUnderlineClickableSpan clickableSpan = new NoUnderlineClickableSpan() {
+            /** Prevent double clicking on the text span. */
+            private boolean mClicked;
+
             @Override
             public void onClick(View widget) {
+                if (mClicked) return;
                 mDelegate.onSurveyTriggered();
 
                 SurveyController.getInstance().showSurveyIfAvailable(
                         tab.getActivity(), mSiteId, mShowAsBottomSheet, mDisplayLogoResId);
                 onCloseButtonClicked();
+                mClicked = true;
             }
         };