Lo-Fi snackbar should only be shown for the first q=low response of a page

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index a9931a7f17a5b4f3a42498e950e3837675632d2b..93bcd93cea14d3f23e8e3539da8a3cda2e3873cb 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -63,6 +63,7 @@ import org.chromium.chrome.browser.printing.TabPrinter;
 import org.chromium.chrome.browser.profiles.Profile;
 import org.chromium.chrome.browser.rlz.RevenueStats;
 import org.chromium.chrome.browser.search_engines.TemplateUrlService;
+import org.chromium.chrome.browser.snackbar.LoFiBarPopupController;
 import org.chromium.chrome.browser.snackbar.SnackbarManager;
 import org.chromium.chrome.browser.ssl.ConnectionSecurityLevel;
 import org.chromium.chrome.browser.ssl.SecurityStateModel;
@@ -360,6 +361,8 @@ public final class Tab implements ViewGroup.OnHierarchyChangeListener,
 
     protected Handler mHandler;
 
+    private LoFiBarPopupController mLoFiBarPopupController;
+
     private class TabContentViewClient extends ContentViewClient {
         @Override
         public void onBackgroundColorChanged(int color) {
@@ -553,6 +556,9 @@ public final class Tab implements ViewGroup.OnHierarchyChangeListener,
                 activity.getApplicationContext(), ChromeActivity.getThemeId()) : null;
         mWindowAndroid = window;
         mLaunchType = type;
+        if (mActivity != null) {
+            mLoFiBarPopupController = new LoFiBarPopupController(activity, getSnackbarManager());
+        }
         if (mThemedApplicationContext != null) {
             Resources resources = mThemedApplicationContext.getResources();
             mIdealFaviconSize = resources.getDimensionPixelSize(R.dimen.default_favicon_size);
@@ -1413,6 +1419,10 @@ public final class Tab implements ViewGroup.OnHierarchyChangeListener,
 
         mIsShowingErrorPage = showingErrorPage;
 
+        if (mLoFiBarPopupController != null) {
+            mLoFiBarPopupController.resetLoFiPopupShownForPageLoad();
+        }
+
         updateTitle();
         removeSadTabIfPresent();
 
@@ -2581,6 +2591,16 @@ public final class Tab implements ViewGroup.OnHierarchyChangeListener,
     }
 
     /**
+     * If a Lo-Fi snackbar has not been shown yet for this page load, a Lo-Fi snackbar is shown.
+     */
+    @CalledByNative
+    public void onLoFiResponseReceived() {
+        if (mLoFiBarPopupController != null) {
+            mLoFiBarPopupController.maybeCreateLoFiBar(this);
+        }
+    }
+
+    /**
      * Request that this tab receive focus. Currently, this function requests focus for the main
      * View (usually a ContentView).
      */