Photo Picker dialog: Add a test.

chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerCategoryView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerCategoryView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerCategoryView.java b/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerCategoryView.java
index 18b21dc42e07bf2b1f21a715fdb49477c02aecd9..ec2622b6f6b4bcfd5d214790d6b6214281c54c96 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerCategoryView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerCategoryView.java
@@ -8,6 +8,7 @@ import android.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Rect;
+import android.support.annotation.Nullable;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.util.LruCache;
@@ -16,6 +17,7 @@ import android.view.View;
 import android.widget.Button;
 import android.widget.RelativeLayout;
 
+import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.widget.selection.SelectableListLayout;
 import org.chromium.chrome.browser.widget.selection.SelectionDelegate;
@@ -90,8 +92,10 @@ public class PickerCategoryView extends RelativeLayout
     // Whether the connection to the service has been established.
     private boolean mServiceReady;
 
-    public PickerCategoryView(Context context) {
+    public PickerCategoryView(Context context, @Nullable List<PickerBitmap> testFiles) {
         super(context);
+
+        mPickerBitmaps = testFiles;
         postConstruction(context);
     }
 
@@ -106,7 +110,9 @@ public class PickerCategoryView extends RelativeLayout
         mDecoderServiceHost = new DecoderServiceHost(this);
         mDecoderServiceHost.bind(mContext);
 
-        enumerateBitmaps();
+        if (mPickerBitmaps == null) {
+            enumerateBitmaps();
+        }
 
         mSelectionDelegate = new SelectionDelegate<PickerBitmap>();
 
@@ -344,4 +350,9 @@ public class PickerCategoryView extends RelativeLayout
             outRect.set(left, top, right, bottom);
         }
     }
+
+    @VisibleForTesting
+    public SelectionDelegate<PickerBitmap> getSelectionDelegateForTesting() {
+        return mSelectionDelegate;
+    }
 }