offline_items_collection : Added helper class to determine progress

components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java

Index: components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java
diff --git a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java
index c4d734d78baf6af413003f76532d3e683c1891b9..000f0a2e08f471497c843343abe305a58a91f696 100644
--- a/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java
+++ b/components/offline_items_collection/core/android/java/src/org/chromium/components/offline_items_collection/OfflineItem.java
@@ -15,6 +15,57 @@ import org.chromium.base.annotations.SuppressFBWarnings;
  */
 @SuppressFBWarnings("URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")
 public class OfflineItem {
+    /**
+     * This class is the Java counterpart to the C++ OfflineItemProgress
+     * (components/offline_items_collection/core/offline_item.h) class.
+     */
+    public static class Progress {
+        public final long value;
+        public final Long max;
+        @OfflineItemProgressUnit
+        public final int unit;
+
+        public Progress(long value, Long max, int unit) {
+            this.value = value;
+            this.max = max;
+            this.unit = unit;
+        }
+
+        /** Helper method to create an indeterminate progress. */
+        public static Progress createIndeterminateProgress() {
+            return new Progress(0, null, OfflineItemProgressUnit.PERCENTAGE);
+        }
+
+        /** Whether the progress is indeterminate. */
+        public boolean isIndeterminate() {
+            return max == null;
+        }
+
+        /** Returns the percentage value. Should not be called on an indeterminate progress. */
+        public int getPercentage() {
+            assert max != null;
+            return max == 0 ? 100 : (int) (value * 100 / max);
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (obj instanceof Progress) {
+                Progress other = (Progress) obj;
+                return value == other.value && unit == other.unit
+                        && (max == other.max || (max != null && max.equals(other.max)));
+            }
+            return false;
+        }
+
+        @Override
+        public int hashCode() {
+            int result = (int) value;
+            result = 31 * result + (max == null ? 0 : max.hashCode());
+            result = 31 * result + unit;
+            return result;
+        }
+    }
+
     public ContentId id;
 
     // Display metadata.
@@ -42,7 +93,7 @@ public class OfflineItem {
     public boolean isResumable;
     public boolean allowMetered;
     public long receivedBytes;
-    public int percentCompleted;
+    public Progress progress;
     public long timeRemainingMs;
 
     public OfflineItem() {