Use larger vector graphics for special tiles and fix selection ring.

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

Index: chrome/android/java/res/layout/photo_picker_bitmap_view.xml
diff --git a/chrome/android/java/res/layout/photo_picker_bitmap_view.xml b/chrome/android/java/res/layout/photo_picker_bitmap_view.xml
index 01718226172e79a6f466476dfbc2bca3bfa3b850..181a334188134272f4bb7d60c8367e817a0c246f 100644
--- a/chrome/android/java/res/layout/photo_picker_bitmap_view.xml
+++ b/chrome/android/java/res/layout/photo_picker_bitmap_view.xml
@@ -32,14 +32,13 @@
             android:visibility="gone" />
     </FrameLayout>
 
-    <ImageView
+    <View
         android:id="@+id/selected"
-        android:layout_width="24dp"
-        android:layout_height="24dp"
-        android:layout_marginStart="4dp"
-        android:layout_marginTop="4dp"
-        android:contentDescription="@null"
-        android:src="@drawable/verify_checkmark"
+        android:layout_width="26dp"
+        android:layout_height="26dp"
+        android:layout_marginStart="2dp"
+        android:layout_marginTop="2dp"
+        android:background="@drawable/checkmark_blue"

[Theresa, 2017/04/26 18:04:31]

We don't gain any APK size savings since the verify_checkmark.png is still used
other places. What do we gain by making this a vector drawable?

Same question about ic_photo_camera.png.

[Finnur, 2017/04/26 20:30:44]

The impetus for this change is not efficiency. There was a PNG supplied by the
designer and, following your suggestion, I switched to use the verify_checkmark
drawable. The designer balked at the results, because that change made the
checkmark grow a white border outline, that it didn't use to have, and loose the
dropshadow. Hence the vector xml.

[Theresa, 2017/04/26 20:47:17]

I didn't realize that the spec had a blue check w/out a white border. It's fine
to introduce a new asset if that's the case.

I'm still wondering about ic_photo_camera, though. Does that have properties not
captured in the PNG. In general, we are trying really hard to avoid one-off
designs and solutions and that includes assets that are displayed.

[Finnur, 2017/04/27 15:02:26]

I'll probably have an answer when I see your feedback on the other question.

         android:visibility="gone" />
 
     <View