Hook up make visible action for views

- try to scroll to the view's bounding rectangle when a client requests make visible
- add switch as a checkbox (matched for that predicate)

BUG=673048

Review-Url: https://codereview.chromium.org/2572573002
Cr-Commit-Position: refs/heads/master@{#438082}

chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js

@@ -57,7 +57,8 @@ AutomationPredicate.match = function(params) {
 };
 
 /** @type {AutomationPredicate.Unary} */
-AutomationPredicate.checkBox = AutomationPredicate.roles([Role.checkBox]);
+AutomationPredicate.checkBox =
+    AutomationPredicate.roles([Role.checkBox, Role.switch]);
 /** @type {AutomationPredicate.Unary} */
 AutomationPredicate.comboBox = AutomationPredicate.roles(
     [Role.comboBox, Role.popUpButton, Role.menuListPopup]);

ui/views/accessibility/ax_view_obj_wrapper.cc

@@ -79,7 +79,7 @@ void AXViewObjWrapper::Focus() {
 }
 
 void AXViewObjWrapper::MakeVisible() {
-  // TODO(dtseng): Implement.
+  view_->ScrollRectToVisible(view_->GetLocalBounds());
 }
 
 void AXViewObjWrapper::SetSelection(int32_t start, int32_t end) {