Add UMA for the app list doodle being clicked.

chrome/browser/ui/app_list/start_page_service.cc

Index: chrome/browser/ui/app_list/start_page_service.cc
diff --git a/chrome/browser/ui/app_list/start_page_service.cc b/chrome/browser/ui/app_list/start_page_service.cc
index d389dc2be042439244ea943d757500720c3deb4e..f02376be9db705621e5e1548b9e0ef5d198cd66c 100644
--- a/chrome/browser/ui/app_list/start_page_service.cc
+++ b/chrome/browser/ui/app_list/start_page_service.cc
@@ -352,14 +352,15 @@ void StartPageService::AppListShown() {
     LoadContents();
   } else if (contents_->IsCrashed()) {
     LoadStartPageURL();
-  } else if (contents_->GetWebUI() &&
-             !HotwordService::IsExperimentalHotwordingEnabled()) {
-    // If experimental hotwording is enabled, don't call onAppListShown.
-    // onAppListShown() initializes the web speech API, which is not used with
+  } else if (contents_->GetWebUI()) {
+    // If experimental hotwording is enabled, don't initialize the web speech
+    // API, which is not used with
     // experimental hotwording.
     contents_->GetWebUI()->CallJavascriptFunction(
         "appList.startPage.onAppListShown",
-        base::FundamentalValue(HotwordEnabled()));
+        base::FundamentalValue(HotwordEnabled()),
+        base::FundamentalValue(
+            !HotwordService::IsExperimentalHotwordingEnabled()));
   }
 
 #if defined(OS_CHROMEOS)