-1 should allow unlimited image rewrites. (#1391)

Author: hillsp

pagespeed/kernel/util/statistics_work_bound.cc

@@ -24,7 +24,7 @@
 namespace net_instaweb {
 
 StatisticsWorkBound::StatisticsWorkBound(UpDownCounter* counter, int bound)
-    : counter_((bound == 0) ? NULL : counter), bound_(bound) { }
+    : counter_((bound <= 0) ? NULL : counter), bound_(bound) { }
 StatisticsWorkBound::~StatisticsWorkBound() { }
 
 bool StatisticsWorkBound::TryToWork() {

pagespeed/kernel/util/statistics_work_bound_test.cc

@@ -100,6 +100,16 @@ TEST_F(StatisticsWorkBoundTest, TestZeroBound) {
   }
 }
 
+// Test that a bound of -1 allows large # of tries.
+TEST_F(StatisticsWorkBoundTest, TestNegativeBound) {
+  scoped_ptr<StatisticsWorkBound> bound1(MakeBound(var1_, -1));
+  scoped_ptr<StatisticsWorkBound> bound2(MakeBound(var1_, -1));
+  for (int i = 0; i < 1000; ++i) {
+    EXPECT_TRUE(bound1->TryToWork());
+    EXPECT_TRUE(bound2->TryToWork());
+  }
+}
+
 // Test that absent variable allows large # of tries.
 TEST_F(StatisticsWorkBoundTest, TestNullVar) {
   scoped_ptr<StatisticsWorkBound> bound1(MakeBound(NULL, 2));