Add launcherPage.hide() API.

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

Index: chrome/browser/extensions/api/launcher_page/launcher_page_api.h
diff --git a/chrome/browser/extensions/api/launcher_page/launcher_page_api.h b/chrome/browser/extensions/api/launcher_page/launcher_page_api.h
index 8f3b915b1c61fb7b69f3fe84cc17f8bb5bcc5d5d..bd39314338c07db830b245a5eb03c6a31b19413c 100644
--- a/chrome/browser/extensions/api/launcher_page/launcher_page_api.h
+++ b/chrome/browser/extensions/api/launcher_page/launcher_page_api.h
@@ -65,6 +65,21 @@ class LauncherPageShowFunction : public UIThreadExtensionFunction {
   DISALLOW_COPY_AND_ASSIGN(LauncherPageShowFunction);
 };
 
+class LauncherPageHideFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("launcherPage.hide", LAUNCHERPAGE_HIDE);
+
+  LauncherPageHideFunction();
+
+ protected:
+  ~LauncherPageHideFunction() override {}
+
+  ResponseAction Run() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LauncherPageHideFunction);
+};
+
 class LauncherPageSetEnabledFunction : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("launcherPage.setEnabled",