[AF Android] Include footer when calculating width

When initially adding the footer functionality to the dropdown, the
possibility that the footer would have a greater width than the rest
of the dropdown was not considered. This CL updates the width
calculation in the base level dropdown class.

Screenshots:
https://docs.google.com/presentation/d/168Uk8_itrZTvf5RfsmCmpkFUebMJo2h61bBZBYQ70i8/edit?usp=sharing

Bug: 874077
Change-Id: I08051ac7302f476ee82ac5e077e49c4cdd00ef88
Reviewed-on: https://chromium-review.googlesource.com/c/1258051Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596348}

ui/android/java/src/org/chromium/ui/DropdownPopupWindowImpl.java

@@ -9,7 +9,9 @@ import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.View.MeasureSpec;
 import android.view.View.OnLayoutChangeListener;
+import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.AdapterView;
 import android.widget.FrameLayout;
@@ -258,6 +260,16 @@ class DropdownPopupWindowImpl
      */
     private int measureContentWidth() {
         assert mAdapter != null : "Set the adapter before showing the popup.";
-        return UiUtils.computeMaxWidthOfListAdapterItems(mAdapter);
+        int adapterWidth = UiUtils.computeMaxWidthOfListAdapterItems(mAdapter);
+        if (mFooterView.getChildCount() > 0) {
+            if (mFooterView.getLayoutParams() == null) {
+                mFooterView.setLayoutParams(new FrameLayout.LayoutParams(
+                        ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
+            }
+            int measureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
+            mFooterView.measure(measureSpec, measureSpec);
+            return Math.max(mFooterView.getMeasuredWidth(), adapterWidth);
+        }
+        return adapterWidth;
     }
 }