Reflect the current state in Media Router Action icon.

chrome/browser/ui/toolbar/media_router_action.cc

Index: chrome/browser/ui/toolbar/media_router_action.cc
diff --git a/chrome/browser/ui/toolbar/media_router_action.cc b/chrome/browser/ui/toolbar/media_router_action.cc
index cc9425e2e29181180028cb4d9f5b94a518816b76..cdfa0ae4332f52ecbd3896b00414eba81a706c43 100644
--- a/chrome/browser/ui/toolbar/media_router_action.cc
+++ b/chrome/browser/ui/toolbar/media_router_action.cc
@@ -5,7 +5,14 @@
 #include "chrome/browser/ui/toolbar/media_router_action.h"
 
 #include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/media/router/issue.h"
+#include "chrome/browser/media/router/media_route.h"
+#include "chrome/browser/media/router/media_router.h"
 #include "chrome/browser/media/router/media_router_dialog_controller.h"
+#include "chrome/browser/media/router/media_router_factory.h"
+#include "chrome/browser/media/router/media_router_mojo_impl.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/toolbar/media_router_action_platform_delegate.h"
 #include "chrome/browser/ui/toolbar/toolbar_action_view_delegate.h"
 #include "chrome/grit/generated_resources.h"
@@ -17,10 +24,20 @@
 using media_router::MediaRouterDialogController;
 
 MediaRouterAction::MediaRouterAction(Browser* browser)
-    : id_("media_router_action"),
+    : media_router::IssuesObserver(GetMediaRouter(browser)),
+      media_router::MediaRoutesObserver(GetMediaRouter(browser)),
+      id_("media_router_action"),
       name_(l10n_util::GetStringUTF16(IDS_MEDIA_ROUTER_TITLE)),
+      media_router_active_icon_(ui::ResourceBundle::GetSharedInstance().
+          GetImageNamed(IDR_MEDIA_ROUTER_ACTIVE_ICON)),
+      media_router_error_icon_(ui::ResourceBundle::GetSharedInstance().
+          GetImageNamed(IDR_MEDIA_ROUTER_ERROR_ICON)),
       media_router_idle_icon_(ui::ResourceBundle::GetSharedInstance().
           GetImageNamed(IDR_MEDIA_ROUTER_IDLE_ICON)),
+      media_router_warning_icon_(ui::ResourceBundle::GetSharedInstance().
+          GetImageNamed(IDR_MEDIA_ROUTER_WARNING_ICON)),
+      current_icon_(&media_router_idle_icon_),
+      has_local_route_(false),
       delegate_(nullptr),
       platform_delegate_(MediaRouterActionPlatformDelegate::Create(browser)),
       contextual_menu_(browser) {
@@ -39,8 +56,7 @@ void MediaRouterAction::SetDelegate(ToolbarActionViewDelegate* delegate) {
 
 gfx::Image MediaRouterAction::GetIcon(content::WebContents* web_contents,
                                       const gfx::Size& size) {
-  // TODO(apacible): Return icon based on casting state.
-  return media_router_idle_icon_;
+  return *current_icon_;
 }
 
 base::string16 MediaRouterAction::GetActionName() const {
@@ -98,6 +114,26 @@ bool MediaRouterAction::ExecuteAction(bool by_user) {
 void MediaRouterAction::UpdateState() {
 }
 
+bool MediaRouterAction::DisabledClickOpensMenu() const {
+  return false;
+}
+
+void MediaRouterAction::OnIssueUpdated(const media_router::Issue* issue) {
+  issue_.reset(issue ? new media_router::Issue(*issue) : nullptr);
+
+  MaybeUpdateIcon();
+}
+
+void MediaRouterAction::OnRoutesUpdated(
+    const std::vector<media_router::MediaRoute>& routes) {
+  has_local_route_ =
+      std::find_if(routes.begin(), routes.end(),
+                   [](const media_router::MediaRoute& route) {
+                      return route.is_local(); }) !=
+      routes.end();
+  MaybeUpdateIcon();
+}
+
 MediaRouterDialogController*
 MediaRouterAction::GetMediaRouterDialogController() {
   DCHECK(delegate_);
@@ -106,6 +142,34 @@ MediaRouterAction::GetMediaRouterDialogController() {
   return MediaRouterDialogController::GetOrCreateForWebContents(web_contents);
 }
 
-bool MediaRouterAction::DisabledClickOpensMenu() const {
-  return false;
+media_router::MediaRouter* MediaRouterAction::GetMediaRouter(Browser* browser) {
+  return media_router::MediaRouterFactory::GetApiForBrowserContext(
+      static_cast<content::BrowserContext*>(browser->profile()));
+}
+
+void MediaRouterAction::MaybeUpdateIcon() {
+  const gfx::Image* new_icon = GetCurrentIcon();
+
+  // Update the current state if it has changed.
+  if (new_icon != current_icon_) {
+    current_icon_ = new_icon;
+
+    // Tell the associated view to update its icon to reflect the change made
+    // above.
+    if (delegate_)
+      delegate_->UpdateState();
+  }
+}
+
+const gfx::Image* MediaRouterAction::GetCurrentIcon() const {
+  // Highest priority is to indicate whether there's an issue.
+  if (issue_) {
+    if (issue_->severity() == media_router::Issue::FATAL)
+      return &media_router_error_icon_;
+    if (issue_->severity() == media_router::Issue::WARNING)
+      return &media_router_warning_icon_;
+  }
+
+  return has_local_route_ ?
+      &media_router_active_icon_ : &media_router_idle_icon_;
 }