android: update DisplayPortCalculator

Change-Id: Ib47822940e83e8fb78a0a8b1e18028646bfb35ae

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/DisplayPortMetrics.java

@@ -6,6 +6,7 @@
 package org.mozilla.gecko.gfx;
 
 import android.graphics.RectF;
+import org.mozilla.gecko.util.FloatUtils;
 
 /*
  * This class keeps track of the area we request Gecko to paint, as well
@@ -32,6 +33,11 @@ public final class DisplayPortMetrics {
         return mPosition.contains(rect);
     }
 
+    public boolean fuzzyEquals(DisplayPortMetrics metrics) {
+        return RectUtils.fuzzyEquals(mPosition, metrics.mPosition)
+            && FloatUtils.fuzzyEquals(mResolution, metrics.mResolution);
+    }
+
     public String toJSON() {
         StringBuffer sb = new StringBuffer(256);
         sb.append("{ \"left\": ").append(mPosition.left)
@@ -43,9 +49,10 @@ public final class DisplayPortMetrics {
         return sb.toString();
     }
 
+    @Override
     public String toString() {
-        return "DisplayPortMetrics(" + mPosition.left + ","
+        return "DisplayPortMetrics v=(" + mPosition.left + ","
                 + mPosition.top + "," + mPosition.right + ","
-                + mPosition.bottom + "," + mResolution + ")";
+                + mPosition.bottom + ") z=" + mResolution;
     }
 }