[Mac] Bounce app shims when app windows request attention.

apps/app_shim/chrome_main_app_mode_mac.mm

Index: apps/app_shim/chrome_main_app_mode_mac.mm
diff --git a/apps/app_shim/chrome_main_app_mode_mac.mm b/apps/app_shim/chrome_main_app_mode_mac.mm
index 18b8f9e1cfdbca32b371e69ba850be1f2bc33587..ad92a736cad8bb300a9558d8b2c685622d9cd821 100644
--- a/apps/app_shim/chrome_main_app_mode_mac.mm
+++ b/apps/app_shim/chrome_main_app_mode_mac.mm
@@ -130,7 +130,7 @@ class AppShimController : public IPC::Listener {
   void OnHide();
 
   // Requests user attention.
-  void OnRequestUserAttention();
+  void OnRequestUserAttention(apps::AppShimAttentionType attention_type);
 
   // Terminates the app shim process.
   void Close();
@@ -140,6 +140,7 @@ class AppShimController : public IPC::Listener {
   base::scoped_nsobject<AppShimDelegate> delegate_;
   bool launch_app_done_;
   bool ping_chrome_reply_received_;
+  NSInteger attention_request_id_;
 
   DISALLOW_COPY_AND_ASSIGN(AppShimController);
 };
@@ -309,8 +310,22 @@ void AppShimController::OnHide() {
   [NSApp hide:nil];
 }
 
-void AppShimController::OnRequestUserAttention() {
-  [NSApp requestUserAttention:NSInformationalRequest];
+void AppShimController::OnRequestUserAttention(
+    apps::AppShimAttentionType attention_type) {
+  switch (attention_type) {
+    case apps::APP_SHIM_ATTENTION_CANCEL:
+      [NSApp cancelUserAttentionRequest:attention_request_id_];
+      attention_request_id_ = 0;
+      break;
+    case apps::APP_SHIM_ATTENTION_CRITICAL:
+      attention_request_id_ = [NSApp requestUserAttention:NSCriticalRequest];
+      break;
+    case apps::APP_SHIM_ATTENTION_INFORMATIONAL:
+      attention_request_id_ =
+          [NSApp requestUserAttention:NSInformationalRequest];
+    default:
+      break;

[tapted, 2014/08/13 03:37:08]

maybe
  case apps::APP_SHIM_ATTENTION_NUM_TYPES:
    NOTREACHED();

This means we get a compile error if an enum value is added

[jackhou1, 2014/08/13 05:53:45]

Done.

+  }
 }
 
 void AppShimController::Close() {