Moved --top-chrome-md command line switch from chrome_switches to ui_base_switches.
The switch needed to be accessible from ui/base/resources for loading the different assets.
Also defined the ENABLE_TOPCHROME_MD compile time switch on linux builds.
TEST=MaterialDesignControllerTest.NonMaterialModeWhenCompileTimeFlagDisabled
TEST=MaterialDesignControllerTest.EnabledCommandLineValueMapsToMaterialModeWhenCompileTimeFlagEnabled
TEST=MaterialDesignControllerTest.EnabledHybridCommandLineValueMapsToMaterialHybridModeWhenCompileTimeFlagEnabled
TEST=MaterialDesignControllerTest.DisabledCommandLineValueMapsToNonMaterialModeWhenCompileTimeFlagEnabled
TEST=MaterialDesignControllerTest.NoCommandLineValueMapsToNonMaterialModeWhenCompileTimeFlagEnabled
TEST=MaterialDesignControllerTest.InvalidCommandLineValueFails
BUG=501366
Review URL: https://codereview.chromium.org/
1188713007
Cr-Commit-Position: refs/heads/master@{#336442}