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

tests/robotests/src/com/android/settings/widget/RoundedHomepageIconTest.java

@@ -0,0 +1,71 @@
+/*
+ * 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 com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.graphics.Color;
+import android.graphics.PorterDuff;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.ShapeDrawable;
+
+import com.android.settings.R;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class RoundedHomepageIconTest {
+
+    private Context mContext;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+    }
+
+    @Test
+    public void createIcon_shouldSetBackgroundAndInset() {
+        final RoundedHomepageIcon icon =
+                new RoundedHomepageIcon(mContext, new ColorDrawable(Color.BLACK));
+
+        assertThat(icon.getNumberOfLayers()).isEqualTo(2);
+        assertThat(icon.getDrawable(0))
+                .isEqualTo(mContext.getDrawable(R.drawable.ic_homepage_generic_background));
+    }
+
+    @Test
+    public void setBackgroundColor_shouldUpdateColorFilter() {
+        final RoundedHomepageIcon icon =
+                spy(new RoundedHomepageIcon(mContext, new ColorDrawable(Color.BLACK)));
+        final ShapeDrawable background = mock(ShapeDrawable.class);
+        when(icon.getDrawable(0)).thenReturn(background);
+
+        icon.setBackgroundColor(Color.BLUE);
+
+        verify(background).setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_ATOP);
+    }
+}