@NonNull
        public Builder setToolbarColor(@ColorInt int color) {
            mDefaultColorSchemeBuilder.setToolbarColor(color);
            return this;
        }
Sets the toolbar color.

On Android L and above, this color is also applied to the status bar. To ensure good
contrast between status bar icons and the background, Custom Tab implementations may use
{@link View#SYSTEM_UI_FLAG_LIGHT_STATUS_BAR} on Android M and above, and use a darkened
color for the status bar on Android L.

@param color {@link Color}
customtabs/src/android/support/customtabs/CustomTabsIntent.java