views: Support configuration of initial window show state

Known issues:
- Exiting full-screen mode currently crashes with the Chrome runtime
  (see issue #3182).

tests/shared/common/client_switches.cc

@@ -46,6 +46,7 @@ const char kLoadExtension[] = "load-extension";
 const char kNoActivate[] = "no-activate";
 const char kEnableChromeRuntime[] = "enable-chrome-runtime";
 const char kShowChromeToolbar[] = "show-chrome-toolbar";
+const char kInitialShowState[] = "initial-show-state";
 
 }  // namespace switches
 }  // namespace client

tests/shared/common/client_switches.h

@@ -40,6 +40,7 @@ extern const char kLoadExtension[];
 extern const char kNoActivate[];
 extern const char kEnableChromeRuntime[];
 extern const char kShowChromeToolbar[];
+extern const char kInitialShowState[];
 
 }  // namespace switches
 }  // namespace client