exo: Fix render node discovery.

components/exo/wayland/clients/motion_events.cc

 // Copyright 2016 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.
 
 // Implementation of a client that produces output in the form of RGBA
 // buffers when receiving pointer/touch events. RGB contains the lower
 // 24 bits of the event timestamp and A is 0xff.
 
 #include <fcntl.h>
 #include <linux-dmabuf-unstable-v1-client-protocol.h>
@@ skipping 461 matching lines @@
     return 1;
   }
 
 #if defined(OZONE_PLATFORM_GBM)
   EGLenum egl_sync_type = 0;
   sk_sp<const GrGLInterface> native_interface;
   if (use_drm_) {
     // Number of files to look for when discovering DRM devices.
     const uint32_t kDrmMaxMinor = 15;
     const uint32_t kRenderNodeStart = 128;
-    const uint32_t kRenderNodeEnd = kRenderNodeStart + kDrmMaxMinor;
+    const uint32_t kRenderNodeEnd = kRenderNodeStart + kDrmMaxMinor + 1;
 
     for (uint32_t i = kRenderNodeStart; i < kRenderNodeEnd; i++) {
       std::string dri_render_node(
           base::StringPrintf(kDriRenderNodeTemplate, i));
       base::ScopedFD drm_fd(open(dri_render_node.c_str(), O_RDWR));
       if (drm_fd.get() < 0)
         continue;
       drmVersionPtr drm_version = drmGetVersion(drm_fd.get());
       if (!drm_version) {
         LOG(ERROR) << "Can't get version for device: '" << dri_render_node
@@ skipping 501 matching lines @@
         new std::string(command_line->GetSwitchValueASCII(switches::kUseDrm)));
   }
 
   exo::wayland::clients::MotionEvents client(
       width, height, scale, num_rects, max_frames_pending,
       command_line->HasSwitch(switches::kFullscreen),
       command_line->HasSwitch(switches::kShowFpsCounter), num_benchmark_runs,
       base::TimeDelta::FromMilliseconds(benchmark_interval_ms), use_drm.get());
   return client.Run();
 }