Revert of Temporarily disable context idle cleanup.

cc/output/context_cache_controller_unittest.cc

Index: cc/output/context_cache_controller_unittest.cc
diff --git a/cc/output/context_cache_controller_unittest.cc b/cc/output/context_cache_controller_unittest.cc
index 5a404a28fa09a772dda2d97db8e57d054919d239..35e1e25a0d5d6356f7320ee0772dcf72c5ad2d23 100644
--- a/cc/output/context_cache_controller_unittest.cc
+++ b/cc/output/context_cache_controller_unittest.cc
@@ -54,11 +54,6 @@
 }
 
 TEST(ContextCacheControllerTest, ScopedBusyWhileVisible) {
-// TODO(ericrk): Temporarily disabling this to investigate whether this
-// code regressed scroll latency on Android. crbug.com/664181
-#if defined(OS_ANDROID)
-  return;
-#endif
   StrictMock<MockContextSupport> context_support;
   auto task_runner = make_scoped_refptr(new base::TestMockTimeTaskRunner);
   ContextCacheController cache_controller(&context_support, task_runner);
@@ -81,11 +76,6 @@
 }
 
 TEST(ContextCacheControllerTest, ScopedBusyWhileNotVisible) {
-// TODO(ericrk): Temporarily disabling this to investigate whether this
-// code regressed scroll latency on Android. crbug.com/664181
-#if defined(OS_ANDROID)
-  return;
-#endif
   StrictMock<MockContextSupport> context_support;
   auto task_runner = make_scoped_refptr(new base::TestMockTimeTaskRunner);
   ContextCacheController cache_controller(&context_support, task_runner);
@@ -98,11 +88,6 @@
 }
 
 TEST(ContextCacheControllerTest, ScopedBusyMulitpleWhileVisible) {
-// TODO(ericrk): Temporarily disabling this to investigate whether this
-// code regressed scroll latency on Android. crbug.com/664181
-#if defined(OS_ANDROID)
-  return;
-#endif
   StrictMock<MockContextSupport> context_support;
   auto task_runner = make_scoped_refptr(new base::TestMockTimeTaskRunner);
   ContextCacheController cache_controller(&context_support, task_runner);