Add AccessibilityStateChanged to CastService

Adding an AccessibilityStateChanged method to CastService so
the browser process can notify any out-of-process (non
chrome renderers) that need to know of that state change.
Base implementation does nothing.  ChromecastService will
override this in a subsequent CL.

Bug: None
Change-Id: I4c85d7ec529906d11b9a469bda25d4fadc0ec5f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539790
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644434}

chromecast/browser/cast_browser_process.cc

@@ -140,5 +140,10 @@ void CastBrowserProcess::SetWebViewFactory(
   web_view_factory_ = web_view_factory;
 }
 
+#if BUILDFLAG(ENABLE_CHROMECAST_EXTENSIONS)
+void CastBrowserProcess::AccessibilityStateChanged(bool enabled) {
+  cast_service_->AccessibilityStateChanged(enabled);
+}
+#endif  // BUILDFLAG(ENABLE_CHROMECAST_EXTENSIONS)
 }  // namespace shell
 }  // namespace chromecast

chromecast/browser/cast_browser_process.h

@@ -59,6 +59,7 @@ class CastBrowserProcess {
   void SetAccessibilityManager(
       std::unique_ptr<AccessibilityManager> accessibility_manager);
   void ClearAccessibilityManager();
+  void AccessibilityStateChanged(bool enabled);
 #endif  // BUILDFLAG(ENABLE_CHROMECAST_EXTENSIONS)
 
   void SetCastScreen(std::unique_ptr<CastScreen> cast_screen);

chromecast/browser/ui/aura/accessibility/automation_manager_aura.cc

@@ -51,6 +51,12 @@ void AutomationManagerAura::Enable() {
         views::AXAuraObjCache::GetInstance()->GetOrCreate(active_window);
     SendEvent(focus, ax::mojom::Event::kChildrenChanged);
   }
+
+  // Notify the browser process of a change to accessibility state so it
+  // can notify any out of out of process (non chrome renderers) that need
+  // to know.
+  chromecast::shell::CastBrowserProcess::GetInstance()
+      ->AccessibilityStateChanged(true);
 }
 
 void AutomationManagerAura::Disable() {

chromecast/service/cast_service.cc

@@ -49,4 +49,8 @@ void CastService::Stop() {
   stopped_ = true;
 }
 
+void CastService::AccessibilityStateChanged(bool enabled) {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace chromecast

chromecast/service/cast_service.h

@@ -34,6 +34,9 @@ class CastService {
   void Start();
   void Stop();
 
+  // Notify out-of-process (non-chrome renderers) of accessibility state.
+  virtual void AccessibilityStateChanged(bool enabled);
+
  protected:
   CastService(content::BrowserContext* browser_context,
               PrefService* pref_service);