Add launcherPage.hide() API.

chrome/browser/extensions/api/launcher_page/launcher_page_api.cc

Index: chrome/browser/extensions/api/launcher_page/launcher_page_api.cc
diff --git a/chrome/browser/extensions/api/launcher_page/launcher_page_api.cc b/chrome/browser/extensions/api/launcher_page/launcher_page_api.cc
index ae0669d7631e2948e265166214b4a89486d47658..faa002c97ed23dad768764bdc5fb432570f0a4e0 100644
--- a/chrome/browser/extensions/api/launcher_page/launcher_page_api.cc
+++ b/chrome/browser/extensions/api/launcher_page/launcher_page_api.cc
@@ -65,6 +65,19 @@ ExtensionFunction::ResponseAction LauncherPageShowFunction::Run() {
   return RespondNow(NoArguments());
 }
 
+LauncherPageHideFunction::LauncherPageHideFunction() {
+}
+
+ExtensionFunction::ResponseAction LauncherPageHideFunction::Run() {
+  chrome::HostDesktopType host_desktop =
+      chrome::GetHostDesktopTypeForNativeWindow(
+          GetAssociatedWebContents()->GetTopLevelNativeWindow());
+
+  AppListService::Get(host_desktop)->HideLauncherPageIfShowing();
+
+  return RespondNow(NoArguments());
+}
+
 LauncherPageSetEnabledFunction::LauncherPageSetEnabledFunction() {
 }