ozone: Allow ozone evdev/kvm features to be enabled without running on ChromeOS.

base/sys_info.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_SYS_INFO_H_
 #define BASE_SYS_INFO_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 112 matching lines @@
   // Returns the creation time of /etc/lsb-release. (Used to get the date and
   // time of the Chrome OS build).
   static Time GetLsbReleaseTime();
 
   // Returns true when actually running in a Chrome OS environment.
   static bool IsRunningOnChromeOS();
 
   // Test method to force re-parsing of lsb-release.
   static void SetChromeOSVersionInfoForTest(const std::string& lsb_release,
                                             const Time& lsb_release_time);
+
+  // Returns true when running as system compositor. Ie. using libudev, kms and
+  // evdev for input and output.
+  static bool IsRunningAsSystemCompositor();

[rjkroege, 2017/01/02 01:26:27]

nitpicking that you can ignore: what you mean here is using ozone yes?

[reveman, 2017/01/02 07:11:32]

I'm expected that we'll keep having support for running ozone Chrome in a non
system compositor mode. E.g. the existing x11 and wayland platforms.

FYI, my initial version of this patch was explicitly checking "ozone_platform ==
gbm" but I decided that it was much easier and more useful to just separate this
into a flag. We can always improve the auto-detection logic for this in the
future.

 #endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_ANDROID)
   // Returns the Android build's codename.
   static std::string GetAndroidBuildCodename();
 
   // Returns the Android build ID.
   static std::string GetAndroidBuildID();
 
   static int DalvikHeapSizeMB();
   static int DalvikHeapGrowthLimitMB();
 #endif  // defined(OS_ANDROID)
 
   // Returns true if this is a low-end device.
   // Low-end device refers to devices having less than 512M memory in the
   // current implementation.
   static bool IsLowEndDevice();
 };
 
 }  // namespace base
 
 #endif  // BASE_SYS_INFO_H_