Prevent maximize/minimize/fullscreen-ize window in trusted pinned mode.

ash/common/wm/window_state.cc

Index: ash/common/wm/window_state.cc
diff --git a/ash/common/wm/window_state.cc b/ash/common/wm/window_state.cc
index 638ee72d132c31c737d3e9057e7e495caa016005..13c4bff394b9a3644a3e7f405c13b02a4e2aab40 100644
--- a/ash/common/wm/window_state.cc
+++ b/ash/common/wm/window_state.cc
@@ -87,6 +87,10 @@ bool WindowState::IsPinned() const {
          GetStateType() == WINDOW_STATE_TYPE_TRUSTED_PINNED;
 }
 
+bool WindowState::IsTrustedPinned() const {
+  return GetStateType() == WINDOW_STATE_TYPE_TRUSTED_PINNED;
+}
+
 bool WindowState::IsNormalStateType() const {
   return GetStateType() == WINDOW_STATE_TYPE_NORMAL ||
          GetStateType() == WINDOW_STATE_TYPE_DEFAULT;