cc: Add scheduler support for invalidating content on impl thread.

cc/scheduler/scheduler_state_machine_unittest.cc

Index: cc/scheduler/scheduler_state_machine_unittest.cc
diff --git a/cc/scheduler/scheduler_state_machine_unittest.cc b/cc/scheduler/scheduler_state_machine_unittest.cc
index aa5c4aac39a1164318196bfee92197fcbc1a2909..0eb422aa421dc2ec60ca27f06d1d10718364ce29 100644
--- a/cc/scheduler/scheduler_state_machine_unittest.cc
+++ b/cc/scheduler/scheduler_state_machine_unittest.cc
@@ -200,6 +200,10 @@ void PerformAction(StateMachine* sm, SchedulerStateMachine::Action action) {
     case SchedulerStateMachine::ACTION_INVALIDATE_COMPOSITOR_FRAME_SINK:
       sm->WillInvalidateCompositorFrameSink();
       return;
+
+    case SchedulerStateMachine::ACTION_RUN_IMPL_SIDE_INVALIDATION:
+      sm->WillRunImplSideInvalidation();
+      return;
   }
 }
 
@@ -2123,5 +2127,40 @@ TEST(SchedulerStateMachineTest,
       SchedulerStateMachine::ACTION_BEGIN_COMPOSITOR_FRAME_SINK_CREATION);
 }
 
+TEST(SchedulerStateMachineTest, ImplSideInvalidations) {
+  SchedulerSettings settings;
+  StateMachine state(settings);
+  SET_UP_STATE(state);
+
+  // Set up request for the main frame and commit to create a pending tree.
+  state.SetNeedsBeginMainFrame();
+  state.OnBeginImplFrame();
+  state.OnBeginImplFrame();
+  EXPECT_ACTION_UPDATE_STATE(
+      SchedulerStateMachine::ACTION_SEND_BEGIN_MAIN_FRAME);
+  EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_NONE);
+
+  state.NotifyBeginMainFrameStarted();
+  state.NotifyReadyToCommit();
+  EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_COMMIT);
+  EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_NONE);
+
+  // Request an impl-side invalidation after the commit. The request should wait
+  // till the current pending tree is activated.
+  state.SetNeedsImplSideInvalidation();
+  EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_NONE);
+
+  // Activate the pending tree.
+  state.NotifyReadyToActivate();
+  EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_ACTIVATE_SYNC_TREE);
+
+  // Since there is no main frame request, activating the pending tree should
+  // run impl-side invalidations.
+  EXPECT_ACTION_UPDATE_STATE(
+      SchedulerStateMachine::ACTION_RUN_IMPL_SIDE_INVALIDATION);
+
+  // Request a main frame, followed by another impl-side invalidation request.
+}
+
 }  // namespace
 }  // namespace cc