Bug 1268019 - Return default icon for download files that do not have intent for handling.;r=VladBaicu

Depends on D34386

Differential Revision: https://phabricator.services.mozilla.com/D34387

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoAppShell.java

@@ -37,6 +37,7 @@ import org.mozilla.gecko.util.ProxySelector;
 import org.mozilla.gecko.util.StrictModeContext;
 import org.mozilla.gecko.util.ThreadUtils;
 import org.mozilla.geckoview.BuildConfig;
+import org.mozilla.geckoview.R;
 
 import android.annotation.SuppressLint;
 import android.app.ActivityManager;
@@ -74,6 +75,7 @@ import android.os.PowerManager;
 import android.os.Vibrator;
 import android.provider.Settings;
 import android.support.annotation.Nullable;
+import android.support.v4.content.res.ResourcesCompat;
 import android.support.v4.util.SimpleArrayMap;
 import android.telephony.TelephonyManager;
 import android.text.TextUtils;
@@ -1428,11 +1430,11 @@ public class GeckoAppShell {
             PackageManager pm = getApplicationContext().getPackageManager();
             Drawable icon = getDrawableForExtension(pm, resolvedExt);
             if (icon == null) {
-                // Use a generic icon
-                icon = pm.getDefaultActivityIcon();
+                // Use a generic icon.
+                icon = ResourcesCompat.getDrawable(getApplicationContext().getResources(), R.drawable.ic_generic_file, getApplicationContext().getTheme());
             }
 
-            Bitmap bitmap = ((BitmapDrawable)icon).getBitmap();
+            Bitmap bitmap = BitmapUtils.getBitmapFromDrawable(icon);
             if (bitmap.getWidth() != resolvedIconSize || bitmap.getHeight() != resolvedIconSize) {
                 bitmap = Bitmap.createScaledBitmap(bitmap, resolvedIconSize, resolvedIconSize, true);
             }

mobile/android/geckoview/src/main/res/drawable/ic_generic_file.xml

@@ -0,0 +1,7 @@
+<vector android:height="24dp" android:viewportHeight="40"
+    android:viewportWidth="40" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FFFFFF" android:pathData="M6.5,37.5l0,-35l18.293,0l8.707,8.707l0,26.293z"/>
+    <path android:fillColor="#788B9C" android:pathData="M24.586,3L33,11.414V37H7V3H24.586M25,2H6v36h28V11L25,2L25,2z"/>
+    <path android:fillColor="#FFFFFF" android:pathData="M24.5,11.5l0,-9l0.293,0l8.707,8.707l0,0.293z"/>
+    <path android:fillColor="#788B9C" android:pathData="M25,3.414L32.586,11H25V3.414M25,2h-1v10h10v-1L25,2L25,2z"/>
+</vector>