Revert of Expose resources in Robolectric/JUnit tests.

chrome/android/junit/src/org/chromium/chrome/browser/suggestions/TileGroupTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/suggestions/TileGroupTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/suggestions/TileGroupTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/suggestions/TileGroupTest.java
index 41da10bd71839b5034cba04d26e999efd3a296d0..4d2bec2a5a4e7ff28456363aa17d9256285b25ad 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/suggestions/TileGroupTest.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/suggestions/TileGroupTest.java
@@ -7,6 +7,7 @@
 import static org.hamcrest.CoreMatchers.is;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThat;
+import static org.junit.Assert.fail;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.anyInt;
@@ -18,8 +19,14 @@
 import static org.mockito.Mockito.verifyNoMoreInteractions;
 import static org.mockito.Mockito.when;
 
+import android.content.Context;
+import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.Color;
+import android.support.annotation.ColorRes;
+import android.support.annotation.DimenRes;
+import android.support.annotation.LayoutRes;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
@@ -36,8 +43,12 @@
 import org.mockito.stubbing.Answer;
 import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowResources;
 
 import org.chromium.base.Callback;
+import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.chrome.browser.Features;
 import org.chromium.chrome.browser.favicon.LargeIconBridge.LargeIconCallback;
@@ -49,7 +60,9 @@
  * Unit tests for {@link TileGroup}.
  */
 @RunWith(LocalRobolectricTestRunner.class)
-@Config(manifest = Config.NONE)
+@Config(manifest = Config.NONE, sdk = 21,
+        shadows = {TileGroupTest.TileShadowResources.class,
+                TileGroupTest.ShadowLayoutInflater.class})
 @Features(@Features.Register(ChromeFeatureList.NTP_OFFLINE_PAGES_FEATURE_NAME))
 public class TileGroupTest {
     private static final int MAX_TILES_TO_FETCH = 4;
@@ -417,4 +430,46 @@
         @Override
         public void destroy() {}
     }
+
+    /**
+     * Replacement for the {@link Resources} to allow loading resources used by {@link TileGroup} in
+     * unit tests.
+     * TODO(https://crbug.com/693573): Needed until unit tests can pick up resources themselves.
+     */
+    @Implements(Resources.class)
+    public static class TileShadowResources extends ShadowResources {
+        @Implementation
+        public int getDimensionPixelSize(@DimenRes int id) {
+            if (id == R.dimen.tile_view_icon_size) return 48;
+
+            throw new IllegalArgumentException();
+        }
+
+        @Implementation
+        public int getColor(@ColorRes int id) {
+            if (id == R.color.default_favicon_background_color) return Color.BLACK;
+
+            throw new IllegalArgumentException();
+        }
+    }
+
+    /** Intercepts calls to inflate views to replace them with mocks. */
+    @Implements(LayoutInflater.class)
+    public static class ShadowLayoutInflater {
+        @Implementation
+        public static LayoutInflater from(Context context) {
+            LayoutInflater layoutInflater = mock(LayoutInflater.class);
+            when(layoutInflater.inflate(anyInt(), any(ViewGroup.class), anyBoolean()))
+                    .thenAnswer(new Answer<View>() {
+                        @Override
+                        public View answer(InvocationOnMock invocation) throws Throwable {
+                            @LayoutRes
+                            int layoutId = invocation.getArgument(0);
+                            if (layoutId != R.layout.tile_view) fail("Unexpected resource id.");
+                            return createMockTileView();
+                        }
+                    });
+            return layoutInflater;
+        }
+    }
 }