[SharingHub] Make share sheet scrollable

Wrap the contents of the share sheet in a ScrollView so
it can be scrolled if it doesn't all fit in the viewport.

Bug: 1127249
Change-Id: Id86b92a52f93b107842f9ddb679537afdec75306
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410310
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807250}

chrome/android/java/res/layout/share_sheet_content.xml

@@ -3,9 +3,14 @@
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
-<LinearLayout
+<ScrollView
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
+  android:id="@+id/share_sheet_scrollview"
+  android:layout_width="match_parent"
+  android:layout_height="match_parent"
+  android:orientation="vertical">
+  <LinearLayout
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
@@ -103,4 +108,5 @@
       android:minHeight="@dimen/min_touch_target_size"
       android:paddingEnd="16dp"
       android:visibility="gone" />
-</LinearLayout>
+  </LinearLayout>
+</ScrollView>

chrome/browser/share/android/java/src/org/chromium/chrome/browser/share/share_sheet/ShareSheetBottomSheetContent.java

@@ -15,6 +15,7 @@ import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.ImageView;
+import android.widget.ScrollView;
 import android.widget.TextView;
 
 import androidx.annotation.ColorInt;
@@ -55,6 +56,7 @@ class ShareSheetBottomSheetContent implements BottomSheetContent, OnItemClickLis
     private ViewGroup mContentView;
     private ShareParams mParams;
     private String mUrl;
+    private ScrollView mContentScrollableView;
 
     /**
      * Creates a ShareSheetBottomSheetContent (custom share sheet) opened from the given activity.
@@ -76,6 +78,7 @@ class ShareSheetBottomSheetContent implements BottomSheetContent, OnItemClickLis
     private void createContentView() {
         mContentView = (ViewGroup) LayoutInflater.from(mContext).inflate(
                 R.layout.share_sheet_content, null);
+        mContentScrollableView = mContentView.findViewById(R.id.share_sheet_scrollview);
     }
 
     /*
@@ -315,6 +318,10 @@ class ShareSheetBottomSheetContent implements BottomSheetContent, OnItemClickLis
 
     @Override
     public int getVerticalScrollOffset() {
+        if (mContentScrollableView != null) {
+            return mContentScrollableView.getScrollY();
+        }
+
         return 0;
     }