Add a config to force rounded icon for DashboardFragment.

And each page has ability to turn on/off rounded icons. This CL only
adds the flag, it doesn't actually change icon shape yet.

- Boolean config in xml
- New protected method for each DashboardFragment to load config
- Plumb the boolean into DashboardFeatureProvider for future use.
- Remove some unused APIs from DashboardFeatureProvider

Bug: 110405144
Fixes: 79748104
Test: robotests
Change-Id: Id34782e75aa7289967e4dd1f4fe2978688092702

src/com/android/settings/widget/RoundedHomepageIcon.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.widget;
+
+import static androidx.annotation.VisibleForTesting.NONE;
+
+import android.content.Context;
+import android.graphics.PorterDuff;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.LayerDrawable;
+import android.util.Log;
+
+import com.android.settings.R;
+
+import androidx.annotation.VisibleForTesting;
+
+public class RoundedHomepageIcon extends LayerDrawable {
+
+    private static final String TAG = "RoundedHomepageIcon";
+
+    @VisibleForTesting(otherwise = NONE)
+    public int mBackgroundColor = -1;
+
+    public RoundedHomepageIcon(Context context, Drawable foreground) {
+        super(new Drawable[] {
+                context.getDrawable(R.drawable.ic_homepage_generic_background),
+                foreground
+        });
+        final int insetPx = context.getResources()
+                .getDimensionPixelSize(R.dimen.dashboard_tile_foreground_image_inset);
+        setLayerInset(1 /* index */, insetPx, insetPx, insetPx, insetPx);
+    }
+
+    public void setBackgroundColor(int color) {
+        mBackgroundColor = color;
+        getDrawable(0).setColorFilter(color, PorterDuff.Mode.SRC_ATOP);
+        Log.d(TAG, "Setting background color " + mBackgroundColor);
+    }
+}