[Android WebView] Implement Ubercomp for Render Thread support

android_webview/common/aw_switches.h

Index: android_webview/common/aw_switches.h
diff --git a/components/os_crypt/os_crypt_switches.cc b/android_webview/common/aw_switches.h
similarity index 51%
copy from components/os_crypt/os_crypt_switches.cc
copy to android_webview/common/aw_switches.h
index 6dffb39489f5d9d0c7a06e409b8e11ce78990343..3e9c378f9e61ce9d21cb2f807274a533df280d8c 100644
--- a/components/os_crypt/os_crypt_switches.cc
+++ b/android_webview/common/aw_switches.h
@@ -2,16 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/os_crypt/os_crypt_switches.h"
+#ifndef ANDROID_WEBVIEW_COMMON_AW_SWITCHES_H_
+#define ANDROID_WEBVIEW_COMMON_AW_SWITCHES_H_
 
-namespace os_crypt {
 namespace switches {
 
-#if defined(OS_MACOSX)
+extern const char kEnableUbercomp[];
 
-const char kUseMockKeychain[] = "use-mock-keychain";
-
-#endif  // OS_MACOSX
+bool UbercompEnabled();
 
 }  // namespace switches
-}  // namespace os_crypt
+
+#endif  // ANDROID_WEBVIEW_COMMON_AW_SWITCHES_H_