Download Home : Added selection ability for prefetch items

Bug: 868205
Change-Id: I9f4b2c8a47c9ad7d3405a5a5cf614e4d2e225435
Reviewed-on: https://chromium-review.googlesource.com/1166463
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582745}

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

@@ -25,10 +25,6 @@
 
     <org.chromium.chrome.browser.download.home.view.SelectionView
         android:id="@+id/selection"
-        android:layout_width="20dp"
-        android:layout_height="20dp"
-        android:layout_gravity="start|top"
-        android:layout_marginStart="6dp"
-        android:layout_marginTop="6dp"/>
+        style="@style/DownloadItemSelectionView"/>
 
 </FrameLayout>

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

@@ -31,6 +31,12 @@
         app:cornerRadiusBottomStart="@dimen/download_manager_prefetch_thumbnail_corner_radius"
         tools:ignore="ContentDescription" />
 
+    <org.chromium.chrome.browser.download.home.view.SelectionView
+        android:id="@+id/selection"
+        style="@style/DownloadItemSelectionView"
+        app:layout_column="0"
+        app:layout_row="0"/>
+
     <Space
         android:layout_width="wrap_content"
         android:layout_height="0dp"

chrome/android/java/res/values-v17/styles.xml

@@ -729,6 +729,12 @@
         <item name="android:ellipsize">end</item>
         <item name="android:singleLine">true</item>
     </style>
+    <style name="DownloadItemSelectionView">
+        <item name="android:layout_width">24dp</item>
+        <item name="android:layout_height">24dp</item>
+        <item name="android:layout_marginStart">8dp</item>
+        <item name="android:layout_marginTop">8dp</item>
+    </style>
 
     <!-- Data Reduction -->
     <style name="TextAppearance.DataUsageBreakdownColumnLabel" parent="@style/BlackButtonText">

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/holder/GenericViewHolder.java

@@ -77,6 +77,7 @@ public class GenericViewHolder extends ThumbnailAwareViewHolder {
     private void updateThumbnailView() {
         Resources resources = itemView.getContext().getResources();
         SelectionView selectionView = itemView.findViewById(R.id.selection);
+        selectionView.setVisibility(selectionView.isSelected() ? View.VISIBLE : View.GONE);
         mThumbnailView.setVisibility(selectionView.isSelected() ? View.GONE : View.VISIBLE);
         if (mThumbnailBitmap != null) {
             assert !mThumbnailBitmap.isRecycled();